Porsche 911 technical FAQ
Questions from the AI assistant, published only after validation.
1result · 4 FAQ published in total.
How should P0420 or P0430 be interpreted?
Validated technical answer
These codes indicate insufficient catalytic-converter efficiency on the affected bank. Before concluding that the catalytic converter is faulty, check for engine misfires, exhaust leaks, the upstream and downstream oxygen sensors, and the fuel-trim values. Compare the sensor signals with a diagnostic scan tool.