LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2020 >> Renegade Trailhawk >> Repair and Diagnosis >> Engine Performance >> System >> 1.3L - DTCS P025D To P0520 >> DTC Troubleshooting >> P0420-Catalyst System Efficiency Below Threshold Bank 1 >> Possible Causes
October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Possible Causes

Possible Causes
EXHAUST LEAK
ENGINE MECHANICAL CONDITION
AGING OR FOULED UPSTREAM O2 SENSOR
CATALYTIC CONVERTER

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

scientia non olet · About LEMON Manuals