The Nissan P0420 code is a diagnostic trouble code (DTC) that indicates a problem with the catalytic converter efficiency. A faulty three-way catalyst converter often causes this code, but it can also be caused by some other factors, including:
Nisssan P0420 common causes
- A faulty three-way catalyst converter bank 1
- Faulty or dirty oxygen sensor
- Faulty spark plug, Injector, or ignition coil
- Air leaks in the exhaust tube or intake manifold
- Damaged or malfunctioning oxygen sensor
- Defective or leaking fuel injectors
- Worn out or misfiring spark plugs
- Incorrect ignition timing
- Air filter dirty or damaged
- Faulty engine control module
Read More: P0420 Toyota Code Catalyst System Efficiency Causes and Fixes
How To fix Nissan P0420
To fix the Nissan P0420 code, you need to diagnose the cause of the problem and replace or repair the faulty part. You may also need to reset the code using a Scan Tool or disconnect the battery. I will recommend using a scan tool to reset the code. After disconnecting the battery terminal, some models do not perform perfectly, like the throttle, radio, and power window. If the problem is not fixed, the p0420 code will return, and Check Engine Light is shown on the dashboard. Taking your Nissan to a professional mechanic for proper diagnosis and repair.
Nissan P0420 Notes
As the code description indicates, a P0420 error indicates that your vehicle’s control module has identified that your three-way catalytic converter isn’t performing according to expectations (i.e., not as efficiently). Replacing the oxygen (O2), sensors may sometimes help resolve this error code, but replacing the catalytic convert will most likely solve your issues. If combined with other codes, try fixing those before returning here with P0420 issues.
Symptoms of P0420
- Check Engine Light ON (Service Engine Soon Light)
- Lack of Power After Warm-up
- Speed may not exceed 30-40 Mph.
- Toxic Smell from Exhaust Pipe
