On Audi/VW applications, P119A / 004506 is commonly listed as “Fuel Pressure Sensor (G247): Malfunction.” Ross-Tech notes the usual symptoms as MIL on plus reduced fuel economy and engine performance. It also lists the main causes as a faulty fuel pressure sensor (G247), wiring/connector problems, a faulty HPFP, a leaking fuel injector, and even an exhaust leak in some cases.

The P189C code means:

👉 DSG clutch adaptation has reached its limit

In simple terms:

• DSG constantly “learns” clutch behavior
• It adjusts pressure & engagement
• When adjustment is maxed out → P189C

The P17BF code means:

👉 DSG clutch has reached its wear limit

In simple terms:

• DSG uses two clutches instead of a torque converter
• Clutches wear over time (like manual clutch)
• ECU detects excessive wear → P17BF

The P164E code means:

👉 Engine oil pressure is BELOW safe limits

In simple terms:

• Engine needs oil pressure to lubricate parts
• Pressure drops too low
• ECU detects risk → triggers P164E

On Audi/VW applications, P2279 / 008825 means “Leak in Air Intake System.” Ross-Tech describes the common symptoms as the MIL being active, and lists likely causes including a vacuum leak, intake manifold runner position out of specification, and a faulty PCV system or heating element (N79).

P310B / 012555 is a VAG/Audi fault for “Low Pressure Fuel Regulation: Fuel Pressure Outside Specification.” In simple terms, the ECU sees the low-pressure fuel system operating outside the allowed range before fuel reaches the high-pressure pump. Ross-Tech lists the likely symptoms as MIL on and reduced power.

The P1557 (17965) code means:

👉 Charge Pressure Control: Positive Deviation

On Audi/VW applications, 17964 / P1556 is defined as “Charge Pressure Control: Negative Deviation.” In plain English, the ECU requested more boost than the turbo system actually delivered. Ross-Tech lists the main symptoms as reduced power output and limp mode. Possible causes include boost pressure too low, hoses/pipes incorrectly connected, disconnected or leaking, charge pressure control defective, turbocharger defective, wastegate/regulating valve problems, and on some applications MAF-related issues.

👉 BSD = Bit Serial Data bus

This is a communication line used by BMW DME (engine ECU) to control and monitor key components.

2E7C is a BSD data bus communication fault. On BMWs that use the BSD bus, the DME communicates with several “smart” components over that single line, and when communication on that line breaks down, the DME can store 2E7C. BMW-focused diagnostic sources repeatedly identify the BSD participants as the IBS (Intelligent Battery Sensor), alternator/voltage regulator, electric coolant pump, and oil level/condition sensor.