KNOWN FAULTS · Audi
Audi A3 (8P) RS3 (2.5 TFSI) common problems.
2003–2012 · Petrol
Sources are not verified in real time and no entry confirms that your car is affected.
3 known faults with sources
Applies if: Only if fitted with the air conditioning system described.
A/C not cooling: N280 valveClimate control
- Engine / equipment
- Air conditioning with clutchless compressor and N280 regulating valve (combustion VW, Audi, Seat, Cupra and Skoda from 2006)
- Period mentioned
- 2006–2026
- Symptoms
- The air does not cool or cools intermittently (for example only at motorway speed), and sometimes the compressor rattles with the A/C on. Codes 01232 (N280 valve), P2612 or 00898.
- Possible cause described
- The compressor regulates its output with the N280 solenoid valve, its most common failure point. Audi issued technical bulletins over a manufacturing fault in this valve on Sanden compressors. Its connector can also become brittle and corrode (especially without the engine undertray), or the wiring fails.
- Check for the garage
- Read the codes and N280 control current with VCDS or ODIS, measure its resistance (about 10 ohms) and check the connector and wiring before replacing parts. If the valve or compressor is replaced, the whole circuit must be flushed.
- Cost cited in the source
- N280 valve: a cheap part (about 30 dollars) where sold separately; new compressor with circuit flush: considerably moreA rough figure from the original database, not an up-to-date quote.
Sources from the original database
Audi (NHTSA): N280 valve bulletin for Sanden compressors (2021)Audi (NHTSA): N280 valve bulletin (2014)Ross-Tech Wiki: N280 valve code P2612Go-Parts: VW and Audi A/C compressor guideAudiZine: code 01232 from an N280 wiring fault
View full entryApplies if: Only RS3 8P 2.5 TFSI MY2011–2012 with DQ500 0BH and physical unit 0BH927711C / A2C31067200; loss of gear selection diagnosed and the fault confirmed by testing. P1735/P1736 only if read and verified on that unit; do not extrapolate to the DQ381 or later generations.
Loss of gear selection with failed DQ500 ECUTransmission / electronics
- Engine / equipment
- RS3 8P: DQ500 0BH, unit 0BH927711C / A2C31067200
- Period mentioned
- Only production periods and VINs documented in the application conditions.
- Symptoms
- Gear selection unavailable; possible P1735/P1736 codes.
- Possible cause described
- Controller defect confirmed through diagnosis and testing; internal mechanism not published.
- Check for the garage
- Confirm gearbox, reference and code reading; rule out connections and test unit before repair.
- Cost cited in the source
- No verified quote; confirm part and diagnosis.A rough figure from the original database, not an up-to-date quote.
Sources from the original database
View full entryApplies if: Only all-wheel-drive versions (4Motion, transverse-engine quattro, 4x4 or 4Drive) with a 4th or 5th generation Haldex coupling.
Haldex all-wheel-drive coupling pumpTransmission
- Engine / equipment
- 4th and 5th generation Haldex coupling in transverse-engine VAG all-wheel-drive cars: VW 4Motion, A3/TT/Q3 quattro, Skoda 4x4 and Seat/Cupra 4Drive
- Period mentioned
- 2007–2020
- Symptoms
- All-wheel-drive warning or a pump error in diagnostics, the car behaves like front-wheel drive (wheelspin in the wet or on gravel) and sometimes no cluster warning even with stored codes.
- Possible cause described
- The electric pump that pressurises the coupling loses flow because the filter (4th generation) and the pump strainer clog with wear debris; dirty oil raises its current draw and burns it out. According to forum owners, dealer services often change the oil but not the filter or strainer, and a new pump fails again if this is skipped.
- Check for the garage
- Read the all-wheel-drive module with VCDS, OBDeleven or ODIS (ODIS shows the pump current) and check in the history when the oil was changed and whether the filter was replaced and the strainer cleaned. After servicing, an adaptation with diagnostic equipment is recommended on generations 4 and 5.
- Cost cited in the source
- Oil, filter and strainer cleaning: maintenance. If the clutch plates are destroyed, an S3 owner quotes about £4,000 to replace the whole unit.A rough figure from the original database, not an up-to-date quote.
Sources from the original database
Kfz-Meisterbetrieb Dietrich: Haldex coupling maintenanceT6 Forum: Haldex pump replacement on a T5.1 4MotionVW California Club (forum): blocked Haldex strainer on a TiguanVW California Club (forum): Haldex 4Motion failure and filterCaravan Club (forum): Tiguan on its third Haldex pump
View full entry