My check engine light came on, so I ran the.

Tiny
ANONYMOUS
  • 1998 FORD EXPEDITION
  • 212 MILES

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.

Tuesday, November 13th, 2012 AT 4:40 AM

1 Reply

Tiny
CARADIODOC
  • EXPERT
  • 26,893 POSTS

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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Tuesday, November 13th, 2012 AT 5:12 AM

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