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  #1  
Old 03-31-2010, 04:23 PM
bleep bleep is offline
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Default oxygen sensor code 21

Hey guys I have a few questions I own a 96 dodge ram 1500 with 118k miles on it. The other day the check engine light came on while driving home. The next day driving to work the light went out only to come back on again on the way back home. I checked the codes using the key on/off method and got the codes 12-21-55. I dont know why the 12 code came on since I dont remember unhooking the battery in the last 50 starts. The 21 I read is the oxygen sensor as I assume most of you probably already know. My questions are how easy is it to change? Where exactly is it? and did replacing the 02 sensor solve the code 21 problem or is there more to it? Also my truck is running fine no stalling or idling problems.
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Old 03-31-2010, 04:27 PM
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Getting the P code would narrow down the diagnostics quite a bit. Just because you have an O2 code doesn't mean the sensor is bad.
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Old 03-31-2010, 06:41 PM
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I think i got it solved. On my truck code 21= p0132 high bank #1 sensor #1 seems easy enough hopefully it can be changed with no complications.
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Old 09-04-2012, 10:30 PM
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Hey, I know this is an old thread, but what was the answer and did the o2 sensor fix the problem??? I have the same code now, and the truck is running terrible after warmup over 30 mph. Thanks!!!
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