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Discussion Starter #1
Hi all
Hope you can help me. I have a jimny 1.3 jlx x reg 2000.
Last year mil came on code was p4020 only just got through mot high emmisions also runs lumpy on tick over. Have changed air filter cranckshaft and o2 sensors. could it be the idle sensor ?
cheers
 

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P0420 - catalytic converter efficiency below threshold? It could be the cat but if it runs badly at idle then it may well be something else. You don't have an idle sensor as such, the TPS is used to determine idle position, its worth checking the TPS calibration. I would also check for vacuum and exhaust leaks. You really need to get a good scan tool on there and start checking the sensor readings, it may well be OBD2 but I would borrow a tool first to check that.
 

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Discussion Starter #3
Thank you Rhinoman
will check for leaks and split or blocked pipes. try and get hold of decent reader. Thanks again
 
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