Here are standard and unique error codes for the Citroen Ds3, received through the on-board diagnostic connector of the OBD-II system of the car, with a brief decoding.

P0030	Oxygen sensor before neutralizer, heater circuit open
P0031	Oxygen sensor before neutralizer, heater circuit short to ground
P0032	Oxygen sensor before neutralizer, heater circuit shorted to +12V
P0036	Oxygen sensor after neutralizer, heater circuit open
P0037	Oxygen sensor after neutralizer, heater circuit short to ground
P0038	Oxygen sensor after neutralizer, heater circuit short to +12V
P0100	Air flow sensor circuit malfunction
P0101	Mass air flow sensor, signal out of range
P0102	Mass Air Flow Sensor, Low Output
P0103	High air flow sensor output level
P0105	Air pressure sensor malfunction
P0106	Manifold Absolute Pressure Sensor Circuit Out of Range
P0107	Manifold Absolute Pressure Sensor Circuit Low
P0108	Manifold Absolute Pressure Sensor Circuit High
P0110	Intake air temperature sensor malfunction
P0111	The intake air temperature sensor signal is out of acceptable range
P0112	Intake air temperature sensor, low output signal
P0113	Intake air temperature sensor, high output signal
P0115	Incorrect signal from the coolant temperature sensor
P0116	Coolant temperature sensor, signal out of range
P0117	Coolant temperature sensor, low output signal
P0118	Coolant temperature sensor, high output signal
P0120	Throttle position sensor (sensor #1) malfunction
P0121	Throttle position sensor, signal out of range (sensor #1)
P0122	Throttle Position Sensor, Low Output (Sensor #1)
P0123	Throttle Position Sensor High Output (Sensor 1)
P0125	Low coolant temperature for closed loop control
P0130	The oxygen sensor before the neutralizer is faulty.
P0131	Pre-catalyst oxygen sensor, low output signal
P0132	Pre-catalyst oxygen sensor, high output
P0133	Pre-catalyst oxygen sensor, slow response to rich or lean
P0134	Oxygen sensor before neutralizer, open circuit signal
P0135	Oxygen sensor before neutralizer, heater is faulty
P0136	Post-catalyst oxygen sensor, open circuit signal
P0137	Post-catalyst oxygen sensor, low signal level
P0138	Post-catalyst oxygen sensor, high signal level
P0139	Oxygen sensor after neutralizer, slow response to enrichment/leanness
P0140	Post-catalyst oxygen sensor, open circuit signal
P0141	Oxygen sensor after neutralizer, heater is faulty
P0171	Too lean mixture (possible air leak)
P0172	Too rich mixture
P0173	Fuel leak from the fuel system of cylinder block No. 2
P0174	The mixture in cylinder block #2 is too lean.
P0175	Cylinder block #2 mixture too rich
P0176	The CHx (Fuel Composition) emission sensor is faulty
P0177	The CHx (Fuel Composition) sensor signal is out of range.
P0178	Low signal level of the CHx (Fuel Composition) sensor
P0179	High signal level of the CHx (Fuel Composition) sensor
P0190	Fuel rail pressure sensor circuit malfunction
P0191	Fuel rail pressure sensor signal is out of range
P0192	Low signal from the fuel rail pressure sensor
P0193	High signal from the fuel rail pressure sensor
P0194	Intermittent signal from the fuel rail pressure sensor
P0195	Engine oil temperature sensor circuit malfunction
P0196	Engine oil temperature sensor signal is out of range
P0197	Engine oil temperature sensor low signal
P0198	Engine oil temperature sensor high signal
P0199	Engine oil temperature sensor intermittent signal
P0200	The injector control circuit is faulty
P0201	Injector #1 control circuit malfunction
P0202	Injector #2 control circuit malfunction
P0203	Injector control circuit failure #3
P0204	Injector #4 control circuit malfunction
P0205	Injector control circuit failure #5
P0206	Injector control circuit failure #6
P0207	Injector control circuit failure #7
P0208	Injector control circuit failure #8
P0209	Injector control circuit failure #9
P0210	Injector control circuit failure #10
P0211	Injector control circuit malfunction #11
P0212	Injector control circuit failure #12
P0213	Cold start injector control circuit failure #1
P0214	Cold start injector control circuit failure #2
P0215	Engine shut-off solenoid malfunction
P0216	Injection timing control circuit malfunction
P0217	Engine overheating, engine temperature above threshold
P0218	Transmission overheating
P0219	Engine speed is too high
P0220	Throttle position sensor (sensor #2) malfunction
P0221	Throttle position sensor (sensor #2) signal out of range
P0222	Throttle Position Sensor Low Output (Sensor 2)
P0223	Throttle Position Sensor High Output (Sensor 2)
P0224	Throttle Position Sensor (TPS) Intermittent Signal Level (Sensor #2)
P0225	Throttle position sensor (sensor #3) malfunction
P0226	Throttle position sensor signal out of range (sensor #3)
P0227	Low signal level of the throttle position sensor (sensor #3)
P0228	High signal level of the throttle position sensor (sensor #3)
P0229	Throttle Position Sensor (Sensor #3) Signal Level Intermittent
P0230	Malfunction of the primary fuel pump control circuit (fuel pump control relay)
P0231	Fuel pump secondary circuit constant low
P0232	Fuel pump secondary circuit constant high
P0233	Fuel pump secondary circuit intermittent level
P0261	Cylinder 1 injector control circuit short to ground
P0262	Cylinder 1 injector control circuit, short to +12V
P0263	Cylinder 1 injector - injector driver malfunction
P0264	Cylinder 2 injector control circuit short to ground
P0265	Cylinder 2 injector control circuit, short to +12V
P0266	Cylinder 2 injector - injector driver malfunction
P0267	Cylinder 3 injector control circuit short to ground
P0268	Cylinder 3 injector control circuit, short to +12V
P0269	Cylinder 3 injector - injector driver malfunction
P0270	Cylinder 4 injector control circuit short to ground
P0271	Cylinder 4 injector control circuit, short to +12V
P0272	Cylinder 4 injector - injector driver malfunction
P0273	Cylinder 5 injector control circuit short to ground
P0274	Cylinder 5 injector control circuit, open or short to +12V
P0275	Cylinder 5 injector - injector driver malfunction
P0276	Cylinder 6 injector control circuit short to ground
P0277	Cylinder 6 injector control circuit, open or short to +12V
P0278	Cylinder 6 injector - injector driver malfunction
P0279	Cylinder 7 injector control circuit short to ground
P0280	Cylinder 7 injector control circuit, open or short to +12V
P0281	Cylinder 7 injector - injector driver malfunction
P0282	Cylinder 8 injector control circuit short to ground
P0283	Cylinder 8 injector control circuit, open or short to +12V
P0284	Cylinder 8 injector - injector driver malfunction
P0285	Cylinder 9 injector control circuit short to ground
P0286	Cylinder 9 injector control circuit, open or short to +12V
P0287	Cylinder 9 injector - injector driver malfunction
P0288	Cylinder 10 injector control circuit short to ground
P0289	Cylinder 10 injector control circuit, open or short to +12V
P0290	Cylinder 10 injector - injector driver malfunction
P0291	Cylinder 11 injector control circuit short to ground
P0292	Cylinder 11 injector control circuit, open or short to +12
P0293	Cylinder injector #11 - injector driver malfunction
P0294	Cylinder 12 injector control circuit short to ground
P0295	Cylinder 12 injector control circuit, open or short to +12V
P0296	Cylinder 12 injector - injector driver malfunction
P0300	Random or multiple misfires detected
P0301	Misfires detected in cylinder 1
P0302	Misfires detected in cylinder 2
P0303	Misfires detected in cylinder 3
P0304	Misfires detected in cylinder 4
P0305	Misfires detected in cylinder 5
P0306	Misfires detected in cylinder 6
P0307	Misfires detected in cylinder 7
P0308	Misfires detected in cylinder 8
P0309	Misfires detected in cylinder 9
P0310	Misfires detected in cylinder 10
P0311	Misfires detected in cylinder 11
P0312	Misfires detected in cylinder 12
P0320	Ignition distributor circuit malfunction
P0321	Ignition distributor signal out of range
P0322	There is no signal from the ignition distributor.
P0323	Ignition distributor signal intermittent
P0325	Knock sensor circuit open
P0326	Knock sensor signal is out of range
P0327	Knock sensor, low signal level
P0328	Knock sensor, high signal level
P0329	Knock sensor, intermittent signal level
P0330	Open circuit of knock sensor #2
P0331	Knock sensor #2 signal is out of range
P0332	Knock sensor #2, low signal level
P0333	Knock sensor #2, high signal level
P0334	Knock sensor #2, intermittent signal level
P0335	Crankshaft position sensor, no signal
P0336	Crankshaft position sensor signal is out of range
P0337	Crankshaft position sensor, short circuit to ground
P0338	Crankshaft position sensor, open circuit
P0339	Crankshaft position sensor, intermittent signal
P0340	The camshaft position sensor is faulty (Camshaft Position Sensor Error)
P0341	The camshaft position sensor signal is outside the acceptable range.
P0342	Camshaft Position Sensor Low Signal
P0343	Camshaft position sensor high signal level
P0344	Camshaft position sensor intermittent signal
P0346	Phase sensor circuit, incorrect signal
P0350	Ignition coil, open circuit, primary circuit current less than threshold value
P0351	Ignition coil cylinder 1, control circuit malfunction or open circuit
P0352	Ignition coil cylinder 2, control circuit malfunction or open circuit
P0353	Ignition coil cylinder 3, control circuit malfunction or open circuit
P0354	Ignition coil cylinder 4, control circuit malfunction or open circuit
P0355	Ignition coil cylinder 5, control circuit malfunction or open circuit
P0356	Ignition coil cylinder 6, control circuit malfunction or open circuit
P0357	Ignition coil cylinder 7, control circuit malfunction or open circuit
P0358	Ignition coil cylinder 8, control circuit malfunction or open circuit
P0359	Ignition coil cylinder 9, control circuit malfunction or open circuit
P0360	Ignition coil cylinder 10, control circuit malfunction or open circuit
P0361	Ignition coil cylinder 11, control circuit malfunction or open circuit
P0362	Ignition coil cylinder 12, control circuit malfunction or open circuit
P0363	Random or multiple misfires detected to protect the catalytic converter
P0400	Exhaust gas recirculation system malfunction
P0401	Inefficiency of the exhaust gas recirculation system
P0402	Exhaust gas recirculation (EGR) system redundancy
P0403	Exhaust gas recirculation sensor circuit malfunction
P0404	EGR sensor signal out of range
P0410	Secondary air supply system malfunction
P0411	Incorrect flow through the secondary air supply system
P0420	The efficiency of the B1 catalyst system is below the permissible threshold
P0421	The heating efficiency of B1 catalysts is below the permissible threshold
P0422	Neutralizer efficiency is below threshold
P0423	The efficiency of the catalyst heater B1 is below the permissible threshold
P0424	The temperature of the catalyst heater B1 is below the permissible threshold
P0430	The efficiency of the B2 catalyst system is below the permissible threshold
P0431	The heating efficiency of B3 catalysts is below the permissible threshold
P0432	The efficiency of the main catalyst B2 is below the permissible threshold
P0433	The efficiency of the catalyst heater B2 is below the permissible threshold
P0434	The temperature of the catalyst heater B2 is below the permissible threshold
P0440	Fuel vapor recovery system control malfunction
P0441	Poor purging of the gasoline vapor recovery system
P0442	Small leak in the gasoline vapor recovery system
P0443	The purge valve control of the canister is faulty.
P0444	Evaporative Canister Purge Valve, Circuit Open Check
P0445	Short to ground in the purge valve circuit of the canister
P0446	Malfunction of the air valve control of the vapor recovery system
P0447	The vapor recovery system air valve is always open.
P0448	The vapor recovery system air valve is always closed.
P0450	Fuel vapor pressure sensor malfunction
P0451	The gasoline vapor pressure sensor signal is out of range.
P0452	Low signal level of the fuel vapor pressure sensor
P0453	High level signal from the gasoline vapor pressure sensor
P0454	Intermittent signal level from the gasoline vapor pressure sensor
P0455	Large leak in the gasoline vapor recovery system
P0458	Evaporative Canister Purge Valve, Checking for Short Circuit to Ground
P0459	Evaporative Emissions Canister Purge Valve, Checking the Short Circuit to +12V
P0460	Fuel level sensor circuit malfunction
P0461	Fuel level sensor signal is out of range
P0462	Low fuel level sensor signal
P0463	Fuel level sensor signal is high
P0464	Fuel level sensor signal level is intermittent
P0465	Purge air flow sensor circuit malfunction
P0466	Purge air flow sensor signal out of range
P0467	Low signal level of the purge air flow sensor
P0468	High level signal from the purge air flow sensor
P0469	Intermittent purge air flow sensor signal level
P0470	Exhaust gas pressure sensor malfunction
P0471	Exhaust gas pressure sensor signal is out of range
P0472	Low signal level of the exhaust gas pressure sensor
P0473	High signal level of the exhaust gas pressure sensor
P0474	Intermittent exhaust gas pressure sensor signal level
P0475	Exhaust gas pressure sensor valve malfunction
P0476	Exhaust gas pressure sensor valve signal out of acceptable range
P0477	Low signal level of the exhaust gas pressure sensor valve
P0478	Exhaust Gas Pressure Sensor Valve High Signal Level
P0479	Intermittent exhaust gas pressure sensor valve signal level
P0480	Fan Relay 1 Control Circuit; Open, Check for Open Circuit
P0481	Fan Relay 2 Control Circuit; Open, Check for Open Circuit
P0485	Cooling fan, checking the supply voltage
P0500	Vehicle speed sensor, no signal
P0501	Vehicle speed sensor error
P0502	Vehicle speed sensor, low signal level
P0503	Vehicle speed sensor, high signal level
P0504	Brake pedal sensor, sensor signals change inconsistently
P0505	Idle air control valve malfunction
P0506	Idle air control valve malfunction - low speed
P0507	Idle air control valve malfunction - high revs
P0510	Throttle valve switch malfunction
P0520	Malfunction in the oil pressure sensor circuit
P0521	Incorrect reading/oil pressure sensor not adjusted
P0522	Oil pressure sensor circuit low
P0523	Oil pressure sensor circuit high
P0530	Malfunction in the air conditioning coolant pressure sensor circuit
P0531	Incorrect reading/out of adjustment of the air conditioning coolant pressure sensor
P0532	Air Conditioning Coolant Pressure Sensor Low Value
P0533	Air Conditioner Coolant Pressure Sensor High Value
P0534	Air conditioner coolant leak
P0550	Malfunction in the power steering pressure sensor circuit
P0551	Incorrect reading/out of adjustment of the power steering pressure sensor
P0552	Low power steering pressure sensor reading
P0553	Power steering pressure sensor high reading
P0554	Power steering pressure sensor malfunction
P0560	On-board voltage is below the system operational threshold
P0561	The system power supply voltage is unstable
P0562	The on-board voltage is low
P0563	The on-board voltage is high
P0565	Cruise control system activation signal malfunction
P0566	Cruise control off signal malfunction
P0567	Cruise control system continue motion signal malfunction
P0568	Cruise control system speed setting signal malfunction
P0569	Cruise control system brake signal malfunction
P0570	Cruise control acceleration signal malfunction
P0571	Malfunction in the brake switch A circuit of the cruise control system
P0572	Cruise control brake switch A low
P0573	Cruise control brake switch A high
P0574	Cruise control system malfunction
P0600	There was a problem communicating with the system.
P0601	Control unit ROM malfunction
P0602	Control unit software error
P0603	Control unit RAM malfunction
P0604	Internal RAM checksum error of the controller
P0605	Error in the control unit memory (ROM)
P0606	Controller, ADC faulty
P0607	Incorrect controller detonation channel signal
P0615	Starter relay control circuit, open circuit
P0616	Starter relay control circuit short to ground
P0617	Starter relay control circuit, short to +12V
P0620	Malfunction in the generator control circuit
P0627	Fuel pump relay, open circuit check
P0628	Fuel pump relay, short circuit to ground
P0629	Fuel pump relay, short circuit to +12V
P0642	Sensor power bus, low signal level
P0643	Sensor power bus, high signal level
P0645	Air conditioning clutch relay, open circuit check
P0646	Air conditioning clutch relay, short circuit to ground
P0647	Air conditioning clutch relay, short circuit to +12V
P0650	Malfunction in the Malfunction Indicator Lamp (MIL) Circuit
P0654	The engine speed is incorrectly adjusted
P0655	Malfunction in the engine warm-up lamp circuit
P0656	Malfunction in the fuel level sensor circuit
P0660	Intake manifold length control valve, open circuit
P0661	Intake manifold length control valve, short circuit to ground
P0662	Intake manifold length control valve, on-board network circuit closure
P0691	Fan Relay 1 Control Circuit Short to Ground
P0692	Fan relay 1 control circuit, short circuit to +12V
P0693	Fan Relay 2 Control Circuit, Short to Ground
P0694	Fan relay 2 control circuit, short circuit to +12V
P0700	Transmission control system malfunction
P0701	Transmission control system out of range
P0702	Electrical transmission control system
P0703	Brake Torque Reduction Sensor B Circuit Malfunction
P0704	Malfunction in the clutch sensor circuit
P0705	Malfunction in the transmission sensor circuit (PRNDL)
P0706	Incorrect reading/out of adjustment of the transmission sensor
P0707	Low transmission sensor reading
P0708	High transmission sensor reading
P0709	Transmission sensor malfunction
P0710	Malfunction in the transmission fluid temperature sensor circuit
P0711	Incorrect reading/out of adjustment of the transmission fluid temperature sensor
P0712	Low transmission fluid temperature sensor reading
P0713	Transmission Fluid Temperature Sensor High Value
P0714	Transmission fluid temperature sensor malfunction
P0715	Malfunction in the turbine speed sensor circuit
P0716	Incorrect reading/turbine speed sensor not adjusted
P0717	There is no signal from the turbine speed sensor.
P0718	Turbine speed sensor malfunction
P0719	Brake Torque Reduced Sensor B Circuit Low
P0720	Malfunction in the shaft speed sensor circuit
P0721	Incorrect reading/shaft speed sensor not adjusted
P0722	No signal from the shaft speed sensor
P0723	Malfunction of the shaft speed sensor
P0724	Brake Torque Reduction Sensor B Circuit High
P0725	Malfunction in the engine speed sensor circuit
P0726	Incorrect reading/engine speed sensor not adjusted
P0727	There is no signal from the engine speed sensor.
P0728	Engine speed sensor malfunction
P0730	The gearbox is incorrectly adjusted
P0731	1st gear is incorrectly adjusted
P0732	2nd gear is incorrectly adjusted
P0733	3rd gear is incorrectly adjusted
P0734	4th gear is not adjusted correctly
P0735	5th gear is not adjusted correctly
P0736	The reverse gear is incorrectly adjusted
P0740	Malfunction in the clutch circuit
P0741	The clutch is incorrectly adjusted
P0742	The clutch is damaged
P0743	Damage to the clutch electrical circuit
P0744	Malfunction in the clutch circuit
P0745	Malfunction in the pressure solenoid circuit
P0746	The pressure solenoid is incorrectly adjusted.
P0747	The pressure solenoid is damaged
P0748	Damage to the electrical circuit of the pressure solenoid
P0749	Pressure solenoid malfunction
P0750	Solenoid switch A malfunction
P0751	Solenoid switch A is incorrectly adjusted
P0752	Damage to switch A solenoid
P0753	Damage to the electrical circuit of the switch A solenoid
P0754	Solenoid switch A malfunction
P0755	Switch B solenoid malfunction
P0756	Solenoid switch B is incorrectly adjusted
P0757	Damage to switch B solenoid
P0758	Damage to the electrical circuit of the switch B solenoid
P0759	Switch B solenoid malfunction
P0760	Switch C solenoid malfunction
P0761	The solenoid switch C is incorrectly adjusted.
P0762	Damage to the C solenoid switch
P0763	Damage to the electrical circuit of the switch C solenoid
P0764	Switch C solenoid malfunction
P0765	D solenoid switch malfunction
P0766	The solenoid switch D is incorrectly adjusted.
P0767	Damage to the D solenoid switch
P0768	Damage to the electrical circuit of the switch D solenoid
P0769	D solenoid switch malfunction
P0770	E solenoid switch malfunction
P0771	The solenoid switch E is incorrectly adjusted.
P0772	Damage to the E solenoid switch
P0773	Damage to the electrical circuit of the switch E solenoid
P0774	E solenoid switch malfunction
P0780	Switch malfunction
P0781	Malfunction of 1-2 switches
P0782	Malfunction of 2-3 switches
P0783	Malfunction of 3-4 switches
P0784	Malfunction of 4-5 switches
P0785	Solenoid malfunction
P0786	Incorrect reading/solenoid not adjusted
P0787	Low solenoid sensor reading
P0788	High solenoid sensor reading
P0789	Solenoid malfunction
P0790	Malfunction in the normal mode switch circuit
P0801	Malfunction in the Reverse Inhibit system control circuit
P0803	Malfunction in the 1-4 switch solenoid circuit
P0804	Malfunction in the indicator lamp circuit of the switch 1-4
P0575	There was a problem communicating with the system.
P0576	There was a problem communicating with the system.
P0577	There was a problem communicating with the system.
P0578	There was a problem communicating with the system.
P0579	There was a problem communicating with the system.
P0580	There was a problem communicating with the system.

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OBD2 error codes for the Citroen DS3 (1st generation)