Hello all, My 03 xterra (3.3 Non SC) with 220,000 miles started hesitating/stumbling at cruising speed. it suddenly cleared up for a couple days and then started getting worse and starting shutting off at stop lights. I had codes read at AZ and they indicate a catalytic converter issue. Codes P0420 bank 1 and P0430 bank 2. After taking to the shop I looked closer at the print out from AZ and the very first code was a P1456 (Fuel tank temperature sensor circuit) and it says it could be a loose fuel cap. The vehicle is still at the shop so I couldn't check it. Could a loose fuel cap cause these symptoms?
Mechanic says it’s the front Catalytic converters. I am also wondering if the oxygen sensors could be causing these symptoms vs the front converters that cost $2000 to replace. (~$700 for each front converter). Additionally I have had knock sensor codes (P0327 and P0328) I have ignored for a couple of years. I found used converters at RockAuto for ~$350. If the converters are actually the issue is it worth taking a chance with used converters?
Thanks in advance for any recommendations.
Mechanic says it’s the front Catalytic converters. I am also wondering if the oxygen sensors could be causing these symptoms vs the front converters that cost $2000 to replace. (~$700 for each front converter). Additionally I have had knock sensor codes (P0327 and P0328) I have ignored for a couple of years. I found used converters at RockAuto for ~$350. If the converters are actually the issue is it worth taking a chance with used converters?
Thanks in advance for any recommendations.