P0141, 90161

[renerodz]

Hi guys,

I started the car this morning and the CEL came on, checked codes as follows:

P0141 O2 SENSOR HEATER MALFUNCTION (BANK1 SENDOR 2)
P0161 O2 SENSOR HEATER MALFUNCTION (BANK2 SENDOR 2) PENDING

After car warmed up, I erased the codes and drove 30 miles and the CEL did not come back, although being heater related they may come back again when starting on cold engine.

Any ideas???

'00 C280 56K miles

Rene

[manny]

On a 4-wire oxygen sensor you have:
2 grounds
1 signal
1 12 volt.

Check, with the key " on ", if you have 12 volts going to the O2 sensor (s).
If you do, you may well need a new one. ;)

[CKlasse]

REN,

Don't bother changing them unless the CEL is consistent. Heated O2S from time to time can set off false signal.

[renerodz]

Started the car today on a cold engine, and the CEL did not came back. It's been 110 miles since I erased the codes.

It is strange though, because it should be rare that both O2 sensors failed at the same time, so something else may have triggered the CEL.

I will keep an eye on it and will update.

Thanks for the help,

Rene

[renerodz]

Or may have been a false signal.

Thanks guys,

Rene