Engine code 21 - JeepForum.com

 
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post #1 of 1 Old 06-30-2013, 07:52 AM Thread Starter
jl-atl
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1995 ZJ 
 
Join Date: Feb 2010
Location: Atlanta
Posts: 17
Engine code 21

On my 1995 Cherokee I have engine code 21. Points to a bad oxygen sensor.

Symptoms (other than code): On occasion while idling at a light the RPMs will drop as if the engine is quitting then it will catch itself and go away. Also have times when it falters when driving.

1. I understand there are 2 sensors on the vehicle. Anyway to know which one is bad or should I replace both or is there something else to check?

2. Where are the oxygen sensors located and how hard are they to replace?

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