VOLVO
ECM-0136 - Rear heated oxygen sensor (HO2S), bank 1.Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
3 modelsC30 (2007–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (13)
- Volvo C30 (2007–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo C30 (2007–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo C30 (2007–2013)2011–2013Engine B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2005Engine B4184S11 only
- Volvo S40 (2004–2013)2006Engine B4184S11, B4184S8 only
- Volvo S40 (2004–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo S40 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2005Engine B4184S11 only
- Volvo V50 (2004–2013)2006Engine B4184S11, B4184S8 only
- Volvo V50 (2004–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo V50 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
What does this fault code mean?
The engine control module has found that the voltage from the rear lambda sensor on bank 1 is higher or lower than expected. The rear sensor sits after the catalytic converter and is used to check that the converter is cleaning the exhaust properly. The fault may come from an open or shorted signal wire, or from a damaged sensor.
Possible causes
- Open circuit or short to ground in the signal wire
- Signal wire shorted to supply voltage
- Damaged rear lambda sensor, bank 1
What you can do
- 1Read, clear the code and road test to see whether it returns
- 2Check that the connector at the rear lambda sensor is fully engaged and free from corrosion
- 3Follow the cable from the rear sensor and look for chafing, pinched sections and loose clips
- 4With the connector unplugged, use a multimeter to check that the signal wire has no connection to ground (the body)
- 5With a diagnostic tool, watch the rear sensor value during a test drive. A value that never changes suggests a signal fault
- 6If the fault remains, have a workshop with diagnostic equipment check the wiring and decide whether the sensor needs replacing
Symptoms you may notice1
- Malfunction indicator lamp (MIL) lit
General guidance for car owners. Diagnosis on the car can point to a different cause.