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2/01/2009
17:48:30

Subject: 1996 5.2L Mil Codes
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I have an odd set of problems. I just got a new exhaust system installed on the truck. Full 14 guage, welded from the Y-pipe back, with new Cat. and Magnaflow muffler. I also had both O2 sensors replaced.

I'm now getting 4 sequential O2 (code 21) sensor errors codes. Can anyone help shed some light on this? I've been told I have to wait for the PCM to re-learn, but it's been over 2 weeks and they haven't cleared yet.

I also have an odd code. Instead of the normal code 55 and the end of the code reading, I'm getting 56. Anyone else had this code, and/or know what the difference is?

I'm taking the truck back in this week to the shop to have the codes re-read by the machine, then clear the codes. I'm going to guess the codes are going to come back, so my next step is to do a PCM reset, but hesitant to do so.

The truck runs great, and idles well, but I have noticed some reduced mileage. I have been in 4x4 a fair amount lately due to the weather, so I know that will affect my mileage, but not to this extent.



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