Question about 2002 Jaguar S-Type
P0420 and p0430 are codes for bank a and bank b catalyst efficiency below threshold. there are 2 sensors on each bank. you dont say if its a v6 or a v8, if its a v6 they are easy to get at from the underside. one has a green connector the other blue, both sides the same, and screw into the exhaust one before cat one after, if its a v8 there not so easy. the connectors are at the back of the cylinder heads one grey one black. my advise would to get it on to some diagnostic equipment to monitor live data to identify the culprit, you dont get both sides going down together. from my experience with these cars if one bank of cylinders has a emission related problem the ecu uses the other bank to compensate which can confuse diagnostics. also one of or both catalysts may be faulty
Posted on Apr 22, 2015
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Posted on Jan 02, 2017
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