P0202
Malfunction of the Fuel Injector, Malfunction of the PCM Fuel Injector driver circuit, Defective wiring/connections in the Fuel Injector wiring harness, Defective Fuel Injector power circuit(s).
- Audi
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 2
- AreaFuel and air metering (injector circuit)
- 02
- FaultThe specific fault in that area
What it means
P0202 on an Audi points to a fault in the cylinder 2 fuel injector circuit. The engine control unit monitors the injector's electrical circuit (power supply, driver and wiring) and has detected an open circuit, short or implausible electrical signal. The exact injector type and circuit layout depend on the model and engine, so check the model-specific wiring information.
Symptoms
- Engine management light on
- Misfire or rough running, especially at idle
- Noticeable loss of power or hesitation
- Hard starting or extended cranking
- Increased fuel consumption
- Engine may run in a reduced-performance mode
Possible causes
- Faulty cylinder 2 fuel injector (open or shorted coil, or internal electrical failure)likely
- Damaged, corroded or loose injector connector or terminals at cylinder 2likely
- Chafed, broken or shorted wiring in the injector harness (to earth, to supply or to another wire)possible
- Fault in the injector power supply or related fuse or relay (depending on model)possible
- Poor earth or connector problem at the engine control unitrare
- Fault in the injector driver stage inside the engine control unitrare
How to diagnose
- Read all stored codes and freeze frame data, noting engine load, temperature and speed when the fault set, and check for other injector or misfire codes
- Visually inspect the cylinder 2 injector connector, terminals and harness for heat damage, rubbing, oil contamination, corrosion or poor locking
- Clear the code and see if it returns immediately, intermittently or only when hot or when the harness is moved
- Use live data or an output test, where supported, to check cylinder 2 misfire counts and injector activation
- Check the injector coil resistance against the manufacturer's specification for that engine
- Check the supply voltage and earth or switching signal at the injector connector using a multimeter or oscilloscope, following the model-specific wiring diagram
- Swap the cylinder 2 injector with another cylinder (if the design allows) and see if the fault follows the injector
- Check the wiring continuity and insulation between the injector connector and the control unit, and only suspect the control unit once everything else is proven
How to fix
- Replace the faulty cylinder 2 injector and have it coded or adapted if the model requires it
- Repair or replace the damaged injector connector, terminals or harness section
- Restore the injector power supply by repairing or replacing a faulty fuse, relay or supply wiring as identified by testing
- Clean and repair poor earth or control unit connector faults
- Replace or repair the engine control unit only after confirming it is the cause, and have it programmed as required
Can I keep driving?
The car can usually be driven short distances to a garage, but a dead injector causes misfiring and can overload the catalytic converter with unburnt fuel. Limit driving, avoid heavy load, and have it fixed soon.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.