Nissan Almera P0420 Fault Code: Diagnosis and Solution Guide
Hi, I'm new to this forum and seeking help with my 2005 Nissan Almera that's showing fault code P0420. I've performed an OBD2 test and received the following results: Component ID 01: - Limit Type: Max - Test Value: 100 - Min Limit: (not specified) - Max Limit: 95 - Status: Fail Component ID 02: - Limit Type: Min - Test Value:
https://www.obd-codes.com/p0420 - P0420 refers to a catalytic converter efficiency below threshold. For Nissan Almera, this often indicates poor exhaust gas conversion. Using a graphing scanner to compare pre- and post-cat O2 sensor readings can help diagnose whether the catalytic converter is functioning properly or if there's an underlying issue like a faulty oxygen sensor or engine misfire.