will small hole in muffler cause codeP0420?

Asked by Sep 02, 2014 at 04:59 PM about the 1999 Chevrolet Silverado 1500 LS Standard Cab LB

Question type: Maintenance & Repair

have '99 silverado,,4'3-V6,,code P0420 appearring no misfire,,running
smooth,,,have small rust hole in muffler

5 Answers

150

no rust hole in muffler will not.

1 people found this helpful.

stamdame is right, to read up on the P0420 go to http://www.obd-codes.com/p0420

150

its the catalytic converter, make sure you replace the right one . Some cars have 3 cats

have read above code site,,,,,,that's where muffler leak idea came from,,,,truck had been recently tuned,,,,plug wire broke causing initial engine light,,,,,,reset ,,,,now showing P0420 but running smooth even under load only visible problem is inch by inch hole at rear of muffler before tailpipe exit

150

its impossible for hole in muffler to cause code. Theres nothing monitoring it. you could actually remove it and it wouldnt matter.

1 people found this helpful.

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