Audi C C2655 Engine Trouble Code
What is Audi C C2655?
When Audi C C2655 code appears, first check your gas cap. Pull over safely, ensure it is tight, and inspect for cracks. A loose or damaged gas cap affects fuel-system pressure and emissions. A replacement cap costs about $3–$10. This simple fix can resolve the code and improve fuel economy.
C2655 on the Audi C
The turbocharged variants of the Audi C are more likely to generate C2655 as boost-related over-fuelling trips the ECU threshold. Inspect the intercooler hoses for micro-cracks that allow unmetered air into the intake stream.
Code Information
| Code Type: | OBD-II Chassis (C) Trouble Code |
| System: | Chassis |
| Vehicle: | Audi C |
| Brand: | Audi |
| Model: | C |
| Code: | C2655 |
C2655 Audi C Symptoms
Check Engine Light
Illuminated Audi C dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Audi C
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Audi C
Increased Emissions
Failed emissions test due to C2655
C2655 Code Structure
Understanding what each digit means in the C2655 chassis trouble code:
| C | 2 | 6 | 5 | 5 |
|---|---|---|---|---|
| Chassis Code | Fuel And Air Metering (Injector Circuit Malfunctions Only) | Fuel Temperature Sensor B Circuit Range/Performance | Cylinder 1 Injector Circuit Low | Crankshaft Position Sensor B Circuit Malfunction |
How to Fix Audi C C2655
Diagnostic Steps:
Oxygen sensors measure exhaust gas oxygen content to optimise air-fuel ratio. This optimisation improves fuel economy and reduces emissions. Sensors degrade over time and require periodic replacement.
Repair Solution:
Disconnected, dirty, or fouled spark plugs commonly prevent proper engine operation. Replace spark plugs every season or 25 hours. Verify proper spark plug gap. If plugs are good, check ignition components: spark plug wires, coils, and ignition module.
Technical Notes:
Parts or components should not be replaced based solely on C2655 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
Audi C C2655 Repair Cost
Fuel injector cleaning service on the Audi C costs $150–$300 for an ultrasonic bench-clean of all injectors with flow-test certification. On-car induction cleaning is a cheaper ($80–$120) first step but is less thorough for heavily fouled injectors.
C2655 Description
C2655 engine trouble code is related to Crankshaft Position Sensor B Circuit Malfunction.
Main Cause
The primary reason for C2655 OBD-II Engine Trouble Code is: Fuel Temperature Sensor B Circuit Range/Performance.
Common C2655 Misdiagnosis on the Audi C
When Audi C presents C2655 with a concurrent coolant temperature DTC, technicians sometimes replace the thermostat rather than the coolant temperature sensor (CTS). The CTS is a $15–$25 component; the thermostat job carries 1–2 hours of additional labour.
DIY Repair Guide: C2655 on Audi C
Clearing C2655 on your Audi C with a basic OBD-II reader ($20–$40) is straightforward: plug the reader into the diagnostic port under the dashboard, read the stored code, and clear it. If it returns within one drive cycle, the underlying fault is still present and requires attention.
Preventing C2655 on the Audi C
Verify that the Audi C engine air box lid clips are fully seated after any air filter service. An unsealed air box is a direct path for unmetered air past the MAF sensor and is an extremely common — and extremely embarrassing — cause of C2655.
Frequently Asked Questions — Audi C C2655
A: Simple fixes like a purge valve or gas cap replacement take under an hour. Sensor replacements typically require 1–2 hours of shop time. More involved repairs like VVT actuators or catalytic converters may require a full day or more.