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Hi everyone,

So basically I spotted my oil pressure switch leaking on my Corsa D (1.2 80cv from 2009 with 75 000km) so I changed it as fast as possible. But I think it had been leaking for quite a bit of time.
I realized that because after spotting the leak I got a check engine light for a P0131 error code, meaning a malfunction detected in the oxygen sensor (bank 1 sensor 1).
So I thought okay I'll just change it, so I ordered it and in the mean time i disconnected the connector and found engine oil pooling inside the oxygen sensor connector.
Then I check several other connectors and found oil pooling in several of them (see pictures below).
In the mean time, I checked my error codes again and got a list of several new codes that weren't so related.
So I disconnected my battery, cleaned every single connector with contact cleaner, including the ECU connector (and there was strictly NO oil pooling around the ECU connector at all so I guess that's a good thing).
Then I reconnected everything and I still get many error codes but always the same ones even after clearing them, just starting the engine makes them pop up again on my OBD2, so mainly the codes are for malfunctions in:
  • Oxygen sensor 1
  • Oxygen sensor 2
  • EVAP Valve
  • EGR system
And I sometimes get "Intake manifold air control actuator, bank 1 - Open circuit".

All these errors appeared all of a sudden while initially there was only the oxygen sensor 1.

  • I also just checked the resistance of my oxygen sensor and it did have 11 ohms so I believe the heater circuit for oxygen sensor 1 does work.
  • I went for a 10 minutes drive and heated up the car and subsequently the oxygen sensors and according to my OBD2 app, it went into Closed Loop while driving.
  • Once I stopped it went back to "Open loop due to system malfunction"
  • I checked most of the fuses and they were good (didn't check all of the bigger ones)
  • I checked the oxygen sensor 1 connector on the car side with the ignition in the first position (engine off electrics ON) and I couldn't find 12 volts on the connector but found around 3.5Volts or so (not sure what to expect but I thought I was supposed to find 12V)
  • The car runs perfectly fine however apart from higher than normal fuel consumption (like 35% higher than normal fuel consumption)
I would really appreciate your help guys!
Thanks in advance!

Here's the list of all error codes I get on my OBD2:


============1==============
P0037
Raw code: 0037
ECU: Engine control unit
Status: Pending
OBDII: Heated oxygen sensor (HO2S) 2, bank 1, heater control - circuit low

============2==============
P0489
Raw code: 0489
ECU: Engine control unit
Status: Pending
OBDII: Exhaust gas recirculation (EGR) system - circuit low
Opel: Exhaust Gas Recirculation (EGR) Motor Control Circuit Short to Ground; Exhaust Gas Recirculation (EGR) Motor Control Circuit Low Input

============3==============
P0031
Raw code: 0031
ECU: Engine control unit
Status: Pending
OBDII: Heated oxygen sensor (HO2S) 1, bank 1, heater control - circuit low

============4==============
P0458
Raw code: 0458
ECU: Engine control unit
Status: Pending
OBDII: Evaporative emission (EVAP) system, EVAP valve - circuit low

============5==============
P0135
Raw code: 0135
ECU: Engine control unit
Status: Pending
OBDII: Heated oxygen sensor (HO2S) 1, bank 1, heater control - circuit malfunction

============6==============
P0141
Raw code: 0141
ECU: Engine control unit
Status: Pending
OBDII: Heated oxygen sensor (HO2S) 2, bank 1, heater control - circuit malfunction

============7==============
P0489
Raw code: 0489
ECU: Engine control unit
Status: DTC supported by calibration, Current DTC, Test not passed since DTC cleared, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up
OBDII: Exhaust gas recirculation (EGR) system - circuit low
Opel: Exhaust Gas Recirculation (EGR) Motor Control Circuit Short to Ground; Exhaust Gas Recirculation (EGR) Motor Control Circuit Low Input
General Electrical Failures [0x00]
============8==============
P0141
Raw code: 0141
ECU: Engine control unit
Status: DTC supported by calibration, Current DTC, Test not passed since DTC cleared, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up
OBDII: Heated oxygen sensor (HO2S) 2, bank 1, heater control - circuit malfunction
General Electrical Failures [0x00]
============9==============
P0037
Raw code: 0037
ECU: Engine control unit
Status: DTC supported by calibration, Current DTC, Test not passed since DTC cleared, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up
OBDII: Heated oxygen sensor (HO2S) 2, bank 1, heater control - circuit low
General Electrical Failures [0x00]
============10==============
P0135
Raw code: 0135
ECU: Engine control unit
Status: DTC supported by calibration, Current DTC, Test not passed since DTC cleared, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up
OBDII: Heated oxygen sensor (HO2S) 1, bank 1, heater control - circuit malfunction
General Electrical Failures [0x00]
============11==============
P0031
Raw code: 0031
ECU: Engine control unit
Status: DTC supported by calibration, Current DTC, Test not passed since DTC cleared, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up
OBDII: Heated oxygen sensor (HO2S) 1, bank 1, heater control - circuit low
General Electrical Failures [0x00]
============12==============
P0458
Raw code: 0458
ECU: Engine control unit
Status: DTC supported by calibration, Current DTC, Test not passed since DTC cleared, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up
OBDII: Evaporative emission (EVAP) system, EVAP valve - circuit low
General Electrical Failures [0x00]
============13==============
P0403
Raw code: 0403
ECU: Engine control unit
Status: DTC supported by calibration, Test failed since DTC cleared, History DTC, Current DTC since power up
OBDII: Exhaust gas recirculation (EGR) - circuit malfunction
Opel: Exhaust Gas Recirculation (EGR) Control Circuit Open
General Electrical Failures [0x00]
============14==============
P0030
Raw code: 0030
ECU: Engine control unit
Status: DTC supported by calibration, Test failed since DTC cleared, History DTC, Current DTC since power up
OBDII: Heated oxygen sensor (HO2S) 1, bank 1, heater control - circuit malfunction
General Electrical Failures [0x00]
============15==============
P2008
Raw code: 2008
ECU: Engine control unit
Status: DTC supported by calibration, Test failed since DTC cleared, History DTC, Current DTC since power up
OBDII: Intake manifold air control actuator, bank 1 - open circuit
General Electrical Failures [0x00]
============16==============
P0444
Raw code: 0444
ECU: Engine control unit
Status: DTC supported by calibration, Test failed since DTC cleared, History DTC, Current DTC since power up
OBDII: Evaporative emission (EVAP) canister purge valve - open circuit
General Electrical Failures [0x00]


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