Checking components and wiring
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Check the heated oxygen sensor (HO2S) and engine control module (ECM) connectors for contact resistance and oxidation according to Contact resistance and oxidation .
Check that the resistance in the heated oxygen sensor (HO2S) preheating element, between terminals 1 and 2, is approximately 5-10 Ω at +20 °C.
Check the signal cable between engine control module (ECM) terminal 63 and heated oxygen sensor (HO2S) terminal 2 for an intermittent open-circuit. Remedy according to Open-circuit, intermittent faults .
Remedy as necessary.
Other information
- To connect the breakout box, see Connecting the breakout box. EMS 2000
- To access / replace the heated oxygen sensor (HO2S), see Replace the front heated oxygen sensor (HO2S) .
- Continue
Refer to Information