MY CHECK ENGINE LIGHT CAME ON SO I RAN THE ...

1998 Ford Expedition

Tiny

Anonymous

November, 13, 2012 AT 4:40 AM

My check engine light came on, so I ran the diagnostic at an auto parts store and it said bank 1 sensor 1 had to be replaced. I know that means that it's the upstream oxygen sensor but I don't know where it goes, can you send me instructions and a diagram please.

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1 Answer

Tiny

caradiodoc

November, 13, 2012 AT 5:12 AM

Diagnostic fault codes never say to replace parts. They only indicate the circuit or system that needs further diagnosis. In the case of the oxygen sensors, there's about a dozen different codes related to them and most have to do with problems in the wiring or that the sensor is reporting a bad condition. You don't automatically replace the sensor when it has detected something wrong. Do you know the exact code number or the exact description?

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