Code 51 - 97 TJ - Jeep Wrangler Forum

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Old 06-07-2011, 11:45 AM
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Join Date: May 2011
Location: Castle Rock
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Code 51 - 97 TJ

So I trying to figure out in my head if this is actually an issue I should be concerned about in my particular case.

I have a Code:51 (on my odometer) A lean air/fuel mixture has been indicated by an abnormally rich correction factor.

The reason behind my thought is that I just replaced the downpipe, cat, muffler, and tailpipe. (left the exhaust manifold as is). I purchased the wrangler without a cat or the post cat O2 sensor. to register for emissions, I now have a cat and both pre and post O2 sensor installed. The Wrangler runs beautifully now and purs like a kitten. I have new cap,rotor, plugs, and wires. My old plugs were carbon fouled.

I'm guessing this isn't an issue because there really was a legitimate reason for the large correction factor. Is this a correct assumption? Or should I be looking for air leaks into the engine?

A New baby and sleepless nights are messing up my rational thinking.
2003 Rubi - Stock... for now.
1999 Sahara 3" rough country, 33 ATs - Sold
1997 Wrangler sport, 4" teraflex, 35 MTRs - Sold
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