This water damaged ECU is a very common failure for Peugeot 206 & 207 vehicles built between 2005 and 2011. The common issue is caused by engine coolant contamination into the wiring harness that travels via ‘capillary action’ up to the plug of the ECU, once the water from the coolant system reaches the ECU it causes the ECU terminals to corrode causing open circuits for various sensors and actuators, this results in host of running problems for the engine.
The most common issues seen are engine misfires, engine not revving properly due to throttle position faults, engine won’t start or cuts out, and normally the Anti-pollution light will also be illuminated on the instrument cluster.
When diagnosing, the fault using a diagnostic scanner there will usually be fault codes stored for the throttle position sensors, injector circuits, coolant/air temperature sensor faults or O2 sensor faults. Often the fault is initially misdiagnosed since the fault codes are blaming other sensors on the car, which can lead to replacing these sensors unnecessarily before identifying that the ECU is the cause of the fault.
This is caused by fluid from the coolant system getting into the main engine wiring harness that travels along and into the ECU. Once the fluid has made its way to the ECU it then causes the corrosion to the pins and internal hardware which causes a high resistance or open circuit for various engine sensor/actuator circuits resulting in the running symptoms described before.
We no longer offer service on this system type. Instead, these are still available from the main dealer to purchase, or you can purchase a used replacement and have the key coding swapped from your original using dealer-level diagnostic equipment.
Common Failure symptoms:
Common fault codes:
Common failing part numbers:
21585768-5 A0 / 21585784-1 A0 / 21585785-4 A / 215859001 A0 / 21585932-9 A / 21585984-5 A / 21586048-9 A / 21586389-9 A / 21586539-8A / 21586562-9 A / 21586563-2 A / 6011 150061 /
6100 269889 / 6192 553788 / 6275 618804 / 6287 628749 / 7052 754374 / 7288 005632 / 7332 434979 / 7349 443826 / 8023 449943 / 8119 003131 / 8154 141 206 / 8184 161516 / 9661 960880
HW9651696680 / HW9655883280
SW9660374680 / SW9661700480 / SW9661960880 / SW9661961280 / SW9661978880 / SW9663306680 / SW9663394480 / SW9663717680 / SW9664127180 / SW9664242980 / SW9664637080 / SW9665050780 / SW9665424480 / SW9665666980 / SW9665799180 / SW9666257580