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What can cause my 2000 Pontiac Grand Am SE 3.4L to get a P0420 CEL Code I replaced the cat both O2 sensor cleaned injectorsEGR worksreplaced fuel pressure relief and filter.Poor gas mileage.?
Wiki User
∙ 9y ago
The P0420 code normally indicates a bad catalectic converter. It can also indicate something wrong with the Powertrain Control Module (PCM), bad ignition timing, bad spark plugs, bad fuel injectors, intake air leaks or bad spark plugs.
Wiki User
∙ 9y ago
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