Engine running lean

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Jul 2, 2008 | 02:02 PM

Gary_ST

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Engine running lean

It appears I have some sort of air leak / O2 sensor problem with my Mondeo ST220. The engine management light is on and the computer says both banks are running lean. I cleared the fault but it came back after 60 miles.

Is it advisable not to drive, whats the worse that could happen? I understand it could run a hotter, but water temp has remained the same.

No apparent loss of performance / smoothness / mpg.

Thanks in advance.

Last edited by Gary_ST; Jul 2, 2008 at 07:19 PM.

Jul 2, 2008 | 07:05 PM

Gary_ST

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Bump.

Jul 2, 2008 | 09:40 PM

pa_sjo

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It should be be fine with any sensor failure.. Best get it fixed though, eh.

Jul 2, 2008 | 09:41 PM

pa_sjo

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edit: You didn't happen to de-cat it recently did you?

Jul 2, 2008 | 10:39 PM

Gary_ST

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No I haven't removed the cats, if it was a sensor failure then wouldn't the ECU log it as that?

Both banks running lean makes me think they share the same problem....

It could be:

MAF
Split vacum pipe
Split PCV pipe
Manifold gasket leak
Fuel filter
Fuel delivery & injectors
Fuel pump
O2 sensors (if one out of four failed, surely it would only highlight one bank running lean / rich?)

Thats all