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P0420
2018 Volkswagen Golf
Volkswagen
Severity
Medium
Safe to Drive
Yes
Est. Time
3hrs
Difficulty
Moderate
SYMPTOM
Check engine light, mild rough idle
Why This Happens
VW's direct-injection engines lack fuel washing over the intake valves, making carbon buildup a uniquely common upstream cause that indirectly loads the catalytic converter.
VERIFIED FIX:
Intake valve carbon cleaning
How It Was Diagnosed
VW's direct-injection engines lack fuel washing over the intake valves, making carbon buildup a uniquely common upstream cause that indirectly loads the catalytic converter.
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