What does fault code ECM-P005335 mean?

Diagnostic fault code details for ECM-P005335 (Volvo S60 (2011–), Volvo S60 (2011–), Volvo S80 (2007–)). Repair service at OBD Tuning.

VOLVO

ECM-P005335 - HO2S Heater Resistance (Bank 1, Sensor 1). FM (Frequency Modulated) / PWM (Pulse Width Modulated) Failures. Signal high time above maximum

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

6 models

S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–)

Show models by year and engine (11)

What does this fault code mean?

Although the code is named as a pulse width fault with a signal that is too high, it concerns resistance in the preheating circuit of the front oxygen sensor being too high.

Possible causes

Oxidation and contact resistance in the connectors
The front oxygen sensor is damaged

What you can do

1Make sure the fuses are intact. Their location is on the fuse chart or in the instruction manual
2Read the fault code with a diagnostic tool with the engine running and note whether it is active
3Check the connector to the front oxygen sensor for looseness, contact resistance and oxidation
4With a multimeter, check that the preheating lead has no open circuit
5Replace the front oxygen sensor if the fault remains after checking the connector and wiring
6Have a workshop with diagnostic equipment check the relevant signals to the sensor if the fault comes back

Symptoms you may notice1

The Check engine lamp lights up or behaves abnormally

General guidance for car owners. Diagnosis on the car can point to a different cause.