...P0421 is a diagnostic trouble code (DTC) for "Warm Up Catalyst Efficiency Below Threshold (Bank 1)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this ...
...code p0421 and p0421 pd OBDII scanned describing something like warm up catalyst threshold bank....Please help I believe this has to do with your catalytic converter. Sounds like it might be getting ...
Question about Dodge Cars & Trucks
Circuit Malfunction https://www.yourmechanic.com/article/p0421-obd-ii-trouble-code-torque-converter-clutch-circuit-malfunction-by-andrew-quinn https://www.repairsmith.com/estimates/trouble-codes/p0740
...p0421 do I have to change sensors or use spark plug trick? Guide me please. there is a code table here:code table Hi guy,this is a Diagnostic Trouble Code Table ,it can help you.And you need a cheap ...
trouble code p0421 could this be a sensor A bad cat, exhaust leak, loose sensor, bad engine controller are the potential causes. Good luck.
Question about Volkswagen Passat
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Question about Cars & Trucks
...P0421, P0431 consistently and P0456 rarely. Can one determine if the cc's are working by the exhaust smell? I have had the threshold codes since I b 120K miles No major accident damage Everything ...
...Code: P0421 Catalyst Efficiency Below Normal (Bank 1) Possible Causes: Air leaks at the exhaust manifold or in the exhaust pipes Catalytic converter is contaminated, damaged or has failed Front HO2S ...
Question about Volkswagen Passat
...code P0421 on a 2000 Miata what can I do to fix this issue I get a OBD11 code of P0421. I have removed and replaced spark plugs and the vehicle is running great. I still get the check engine light ...
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