What causes the P0420 code?
- Damaged muffler or leaks in the muffler
- Damaged exhaust manifold or leaks in the exhaust manifold
- Damaged exhaust pipe or exhaust pipe leaks
- A misfire in the engine
- Oil contamination in catalytic converter
- Faulty catalytic converter (most common)
- Faulty engine coolant temperature sensor
- Faulty front oxygen sensor
- Faulty rear oxygen sensor
- Damaged oxygen sensor wiring
- Oxygen sensor wiring that is not properly connected
- Damaged oxygen sensor connectors
- A fuel injector that is leaking
- Fuel pressure that is high
- Use of the wrong kind of fuel (using leaded fuel instead of unleaded fuel)
What are the symptoms of the P0420 code?
- No noticeable symptoms or driveability problems (most common)
- Check Engine Light is on
- Lack of power after vehicle warms up
- Speed of vehicle may not exceed 30-40 mph
- Rotten egg smell coming from exhaust pipe
What repairs can fix the P0420 code?
- Replace muffler or repair leaks in the muffler
- Replace exhaust manifold or repair leaks in the exhaust manifold
- Replace exhaust pipe or repair exhaust pipe leaks
- Replace catalytic converter (most common)
- Replace engine coolant temperature sensor
- Replace front or rear oxygen sensor
- Repair or replace damaged wiring to oxygen sensor(s)
- Repair or replace oxygen sensor connector(s)
- Replace or repair fuel injector(s) that are leaking
- Diagnose any repair any misfiring problems
- Diagnose and repair any other related trouble codes that have been stored by the Power Control Module (PCM)
https://www.autoblog.com/2016/04/06/p0420-obd-ii-trouble-code-catalyst-system-efficiency-below-thre/
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