Help with Code meaning

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Apr 5, 2010 | 05:22 PM

latigo1

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Help with Code meaning

I have a 99 Expedition. The code reads:

Lack of HO251
Switches - Lean
Bank 1 Sensor 1

Does anybody know what this means?

Apr 5, 2010 | 06:03 PM

alloro

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It means your Heated O2 sensor on the passenger side, before the catalytic converter, is acting up or is reading a lean condition in the exhaust system on that side of the engine.

Apr 5, 2010 | 08:19 PM

latigo1

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Thanks for the help.

Should I change the O2 sensor, or is there another reason it's reading the way it is?

Apr 5, 2010 | 08:49 PM

alloro

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A lean condition can be the result of a leaking intake manifold gasket on that side of the engine, or it could just be a bad O2 sensor. Without further diagnostics it's just a guessing game as to which solution would solve the problem.

Apr 6, 2010 | 04:18 AM

latigo1

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Thanks very much for the help.

Is it alright to drive it like this for about a week? Or should I get it fixed immediately? It's running a little rough.

Last edited by latigo1; Apr 6, 2010 at 04:19 AM. Reason: More info