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I have a 1996 Intrepid ES with the 3.5 Liter V-6, and my check engine light recently came on...I was told it needs a new oxygen sensor, and they said that Intrepid's have 2? How many do they have? I can see 2 of them. I already bought 2 new ones, I just need them to be put it...and my check engine light hasn't came on for a few days. I did the ignition code trick, and the Check Engine light blinked in this order: 1 2 5 1 5 5.
I got the code numbers off the internet, but they are all 2 digit numbers...what do I do? Get the sensors replaced? And what do my numbers mean....please reply back on the forum, or e-mail me at [email protected] I would rather be e-mailed directly. It would be greatly appreciated....thank you.
 

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you have codes 12 51 and 55. You will always have 12 and 55. Code 51 as stated by allpar.com is.... "51 Oxygen sensor stuck at lean position (Bob wrote: may be tripped by a bad EGR system causing a rich condition, and the O2 sensor trying to compensate. The O2 sensor may still be good. The EGR assembly consists of two pieces, the valve and the vacuum transducer (round plastic unit with cylinder on top and both electrical and vacuum connections)"

Not sure what all that means maybe someone else can explain.
 

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i've had no problems with my drop-in k&n. i'd say it's a strange coincidence.
 

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my K&N isn't spoiling any sensors yet. (a month)
 

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I was told my Trep had 4 oxygen sensors, I replaced one at 63K 97/3.5L anyone else have 4?
 

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The Haynes manual says one the '96 has 4 Oxygen sensors.... and I have a '96.
 

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Looking at my Haynes manual: code 51 is, as stated, O2 sensor signal input indicates lean fuel/air ratio condition during engine operation. There's many reasons that could happen, but I suspect if you're getting more air from your filter, your computer could adjust the fuel mixture. So I would guess, it's probably from something else. 2nd from the manual: 96 models are equpped with 4 O2 sensors; right bank and left bank upstream O2 sensors and left and right downstream (after catalytic converter) oxygen sensors.
 

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your 96 3.5 has four O2 sensors, two upstream and two downstream, which O2 sensor went bad, and which bank........ Bank 1 would indicate the abd O2 sensor is on the side of the engine with cylinder one one it, and sensor one would indicate the upstream sensor. The upstreams are on either exhaust manifold and the two downstream are located jsut prior to the catlytic converter
 

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That code doesn't definitely indicate the O2 sensor went bad. Something like a code 21, problem with O2 sensor signal circuit, sensor voltage to computer not fluctuating, would be an O2 problem, but that could be a bunch of other things.
 
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