[eugenelt]

Hi all,
Got a check engine light, ODB reader gave this code.
The light stayed for a few days, then went off, then on again.
The car takes longer to warm up (about twice as long) - not sure if that's related.

Anyone had this issue? What needs to be done ?

Thanks !

 

[cardoc]

When did you replace the thermostat last?

 

[eugenelt]

When did you replace the thermostat last?

I, frankly, not sure I ever did.. IIRC, mechanic said "replace it when there's a need for it".
This error code relates to thermostat ?

 

[cardoc]

If the engine temperature is not coming up fast enough, yes.

Other possibilities are weak ground to the sensor or the heater circuit in the AF sensor is weak or burned out and it needs replacement.

Unless something has impacted the harness leading to the sensor plug, it is either the thermostat or sensor that needs replacement. If you are running with the original thermostat, you may want to replace it anyway. Better than waiting for it to stick closed and cause an overheating issue, or stick open and the engine performance suffer.

 

[eugenelt]

Will start with thermostat, and see if it'll fix it.
Will report back.

Thanks !

 

[cardoc]

Remember, it can also be a bad heater circuit within the AF sensor. The thermostat would be a good idea, but you may still need a sensor. It can be checked with an DVOM by checking the resistance between pins 3 and 4 of the sensor plug. 3 and 4 are the two opposite the locking tab. If its over 5 ohms, replace the sensor.