![]() Most of the time that is exactly what it is. When you get a P0420 code that indicates a failing catalytic converter. If the P0420 code goes away, it was probably just due to water affecting the rear O2 sensor (probably via wiring harness). ![]() What would be causing the.2002 Chrysler Town and Country - 3.8L - 223,000 miles - Dead 2002 Dodge Grand Caravan Sport - 3.3L - 105,000 miles - Wife's DD. ![]() Fill the gas tank up and the engine light goes off until gas tank is around 1/4 full then engine light comes back on and so on and so forth. Engine light comes on when gas tank is between 1/4 to 1/2 full. Any DTC or condition that increases emissions or affects sensor readings can cause a converter to fail the ECM tests even if the converter is good.2012 Town and Country with 58,000 miles. First to verify the presence of the P0420 and/or P0430 DTCs but to also check for any others that might be recorded in the ECM. Chrysler 300m 1999 trouble code p0420? Trouble code P0420 means:Catalyst system efficiency below thresholdNext, a scan tool check. ![]() After the light came back on, I checked for codes again and …A 2000 Chrysler Town and Country does not have a keyless code. Then the light went out and stayed out until a couple days ago. A search on the Internet for this code found: HO2S Circuit High Voltage Bank 1 Sensor 2. A few weeks ago my check engine light came on and code P0138 showed up. ![]()
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