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post #1 of 5 Old 06-04-2011, 07:52 AM Thread Starter
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2001 XJ Cherokee 
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Emission issues

Hello all, I have been having issues with two codes. 4055, 4032. I have decided to deal with them one at a time. I have replaced the converted and 02 sensor on the rear manifold, but 4032 code persists. Any ideas as to what it could be now.

As for the 4055, I plan on getting a smoke test and go from there.

Urggg. Any help would be much appreciated as I am trying to get through emissions test.

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post #2 of 5 Old 06-04-2011, 09:08 AM
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How did you pull those codes? Those are not normal OBD-II codes.
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post #3 of 5 Old 06-05-2011, 08:10 AM Thread Starter
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I was abbreviating. I used a code puller. PO4055, PO4032
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post #4 of 5 Old 06-05-2011, 09:32 AM
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2000 XJ Cherokee 
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P0432 (M)1/2 Catalytic Converter Efficiency. Catalyst 2/1 efficiency below required level.


As catalyst efficiency deteriorates, the switch rate of the downstream O2 sensor approaches that of the upstream O2 sensor. If at any point during the test the switch ratio reaches a predetermined value a counter is incremented by one.


-Exhaust leak
-Catalytic converter 2/1 faulty
-Upstream O2 sensor older than downstream O2 sensor
-engine misfire or running condition
-large vacuum leak
-engine oil leakage into exhaust-valve guide, seals, piston rings

P0455 (M) Evap Leak Monitor Large. Leak Detected A large leak has been detected in the evaporative system.

Buy a new gas tank cap. Check the hoses and fittings from the Evap solenoid and LDP for loose hoses/fittings or damage.
Also check for disconnected or damaged wires.

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Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ...

Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
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post #5 of 5 Old 05-31-2012, 05:27 PM
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Reviving old thread because I'd like to see what was the outcome of the smoke test as I just bought an '01 XJ which popped up the CEL and code a day after purchase.

Wrenching isn't the problem, it's the brains attached to the hands...unfortunately, I'm lacking some of the former so that's why I'm asking you guys!!

Originally Posted by YJake View Post
My YJ is so excited it's leaking oil!
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