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1999 Other Ford Models Oxygen Sensors

Tiny
KIMBERLYCOY
  • MEMBER
  • 1999 FORD
  • 4 CYL
  • FWD
  • MANUAL
  • 130,000 MILES
I ran a diagnostic check on my car because the service engine light keeps coming on. I got the code p 1131 and looked it up online. I found that it was the O2 sensor. I called a parts store to price it and was told there are 2 on the car I have and my question is, which one of the 2 is it more common to go out. It is an Escort ZX2.

Thank you.
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Wednesday, April 8th, 2009 AT 7:20 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Hi there,

with 2 O2 sensors, the up stream sensor is the active unit, the down stream is for collaboration, you can check this by, clearing the codes and un plugging the rear sensor, and see if it set the same code.

Mark (mhpautos)
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Wednesday, April 8th, 2009 AT 8:21 PM

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