P0171 & P0172 Too Rich Too Lean-Both - Jeep Wrangler Forum

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Old 06-23-2015, 04:29 AM   #1
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P0171 & P0172 Too Rich Too Lean-Both

I just bought my first 97 Jeep Wrangler. Bought it cheap with check engine light on reading p0171 & p0172. Seller had receipts where he changed all O2 Sensors, air filter, fuel pump, fuel injectors, catalytic converter, and I already sealed leaking exhaust at manifold and catalytic converter. Firestone checked O2 sensors and advised they are running fine. Any ideas?
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Old 06-23-2015, 07:13 PM   #2
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Two suggestions: get a scanner that reads the various sensors in real time and put your questions in the TJ section (this is the CJ section). Is it the 4 cylinder?

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Old 06-24-2015, 04:18 AM   #3
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Will move to TJ, thank you.
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