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John S.
Dodge Dakota
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6/05/2002
00:15:49
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 Subject: Code 21 = bad o2 sensor?
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Message:
Hey all,
My truck has periods when it doesnt run well at all- it misses, rattles, backfires, and loses power big time. It only happens sometimes-
Truck is a '97 sport 4 cylinder with 57K miles- 5 speed tranny.
Anyways it started to run bad and I got a check engine light- came up with a code 21.
In fact, I keep getting a code 21 randomly.
Would this be a bad o2 sensor?
Should I replace both before and after cat sensors?
Thanks for any help, truck has a new cap, rotor, plugs, air filter. Thanks again,
-John
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John S.
Dodge Dakota
JOIN HERE
6/05/2002
12:17:51
| RE: Code 21 = bad o2 sensor?
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Message:
anyone?
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Toby
Dodge Dakota
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6/05/2002
14:54:49
| RE: Code 21 = bad o2 sensor?
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Message:
Wow you just described my truck to a T. Exactly like you said, runs like crap sometimes, intermitent code 21. I have replaced both O2 sensors and it still does it
Toby
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John S.
Dodge Dakota
JOIN HERE
6/05/2002
14:59:26
| RE: Code 21 = bad o2 sensor?
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Message:
That worries me now-
what year truck do you have?
I had the auto parts store plug their computer into my truck and they said the first o2 sensor is bad-
lets hope for the best.
what else have u tried?
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Toby
Dodge Dakota
JOIN HERE
6/05/2002
22:08:04
| RE: Code 21 = bad o2 sensor?
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Message:
My truck is a 97 5.2 4x4. All I did was replace both O2 sensors. I think I will go have them pull the code with the scanner at checker.
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John S.
Dodge Dakota
JOIN HERE
6/06/2002
23:51:07
| RE: Code 21 = bad o2 sensor?
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Message:
Well after putting 250 miles on the truck since I did the o2 sensor I have had no problems or anything- no check engine lights since- seems to have corrected the problem, good luck to you.
-John
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