Peugeot 207 & 206 engine ECU with common water damage

Peugeot 206 & 207 engine ECU water ingress

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.

Peugeot 207 ECU     Water damaged Peugeot 207 ECU

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.

Water ingress 207 ECUEngine ECU water damage

 

Solution

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:

  • Engine misfire
  • Throttle problems
  • Engine cutting out
  • Engine will not start
  • Fault codes for throttle position sensors
  • Fault codes for coolant temp sensor
  • Fault codes for O2 sensor

 

Common fault codes:

  • P0121 – Signal Incoherence Between Motorised Throttle Signals 1 And 2
  • P1161 – Throttle Position Regulation
  • P1631 – Engine ECU Internal
  • P1340 – Engine Misfire Detected
  • P0123 – Throttle Position Sensor
  • P2176 – Programming of The Motorised Throttle Limp Home Coherence
  • P0135 – O2 Heating Implausible Signal
  • P0115 – Engine Coolant Temperature Sensor Fault
  • P0110 – Intake Air Temperature Sensor Circuit Fault

 

Affected Vehicles:

  • Peugeot 206 (2006 – 2009)
  • Peugeot 207 (2007 – 2011)
  • Peugeot 1007 (2005 – 2010)
  • Peugeot Partner (2005 – 2011)

 

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

Peugeot Products/Services

1007

106

107

108

2008

206

207

207 CC

208

3008

306

307

308

4007

406

407

5008

508

607

806

807

BIPPER

BOXER

E7

EXPERT

PARTNER

PARTNER COMBI

PARTNER HORIZON

PARTNER TEPEE

RCZ

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