P0420, P0430, P1351 Fault Codes on 1997 Chevrolet Silverado 5.7L V8 - Diagnosis and Fixes

Model: 97 Chevy Silverado 5.7L Fault Code: P0420 Posted: 2007-04-06 13:09

The fault codes P0420 (Catalyst System Efficiency Below Threshold), P0430 (Catalyst System Efficiency Below Threshold Bank 2), and P1351 (Oxygen Sensor Circuit Malfunction) on a 1997 Chevrolet Silverado with a 5.7L V8 engine indicate potential issues in the exhaust system or fuel delivery. First, verify that the fuel pressure regulator is functioning correctly. Then inspect for leaks in fuel injectors and associated lines, as fuel leakage back to the tank can cause these codes. If the return line is blocked and fuel pressure drops significantly, further investigation of the injectors or fuel lines is required to identify the root cause.