VOLVO
ECM-D00E - Front heated oxygen sensor (HO2S). Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S60 (2001–2009), S70 (1997–2000), S80 (1999–2006), V70 (1997–2000), V70 (2000–2008)
Show models by year and engine (12)
- Volvo C70 Cabriolet (1998–2005)2000Engine B5244S only
- Volvo C70 Coupé (1998–2002)1999Engine B5254S DENSO only
- Volvo C70 Coupé (1998–2002)2000Engine B5244S only
- Volvo S60 (2001–2009)2001–2002Engine B5244S, B5244S2 only
- Volvo S70 (1997–2000)1999Engine B5254S DENSO only
- Volvo S70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)1999–2000, 2002Engine B5244S, B5244S2 only
- Volvo S80 (1999–2006)2001Engine B5244S, B5244S2, B5244SG only
- Volvo V70 (1997–2000)1999Engine B5254S DENSO only
- Volvo V70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2001Engine B5244S, B5244S2, B5244SG only
- Volvo V70 (2000–2008)2002Engine B5244S, B5244S2 only
What does this fault code mean?
The engine control module checks that the front heated oxygen sensor switches between rich and lean mixture as it should. The fault code is set when the module registers a fault in the sensor, and closed-loop lambda control is then switched off.
Possible causes
- Defective front heated oxygen sensor (HO2S)
What you can do
- 1Check that the connector to the front oxygen sensor is firmly seated and not corroded
- 2Check that the wires to the sensor are not chafed or pinched
- 3If you have a diagnostic tool: read the oxygen sensor signal in live data with the engine running and check that it switches between rich and lean
- 4Erase the fault code and road test the car to see whether it comes back
- 5If the fault remains, try a new front oxygen sensor or have a workshop check the sensor
Symptoms you may notice1
- No noticeable symptoms for the driver
What the fault can affect1
- Lambda control is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.