1995 Toyota Corolla O2 sensors

1995 TOYOTA COROLLA
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MEQUENI
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Engine Performance problem
1995 Toyota Corolla Front Wheel Drive Manual

I have code 21 but its got 2 sensors how do i determine which one to change
Sep 4, 2010 at 3:27 PM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
Hi there,

Normally It is the upstream sensor, but if you get an OBD11 scan it will define which sensor is at fault.

mark (mhpautos)
Sep 4, 2010 at 9:11 PM
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