2001 Toyota Tundra Code P0420

The P0420 code is set when the Catalyst monitor sees a decrease in voltage from the rear Monitoring Oxygen Sensors and an increase in switching activityfrom rich to lean to rich etcthat closely resembles the front Oxygen Sensors during the time the computer is activating the Catalytic Converter monitor test.

2001 toyota tundra code p0420. It doesnt matter which model you have this OBDII code has the same meaning for all of them. One of the most common trouble codes with all Toyota vehicles is the P0420. Leaded fuel in the system.

This trouble code references a number that is given to you when you plug your Tundra into a OBDII scanner. P0420 Toyota Description. P0442 Toyota Solara.

Top Causes of P0420 in the Toyota Solara. Oxygen Sensor The P0420 codes is thrown when the oxygen sensors on both sides of the exhaust have very similar. The code is P0420 Repair information P0420 - Catalyst System Efficiency Below Threshold Bank 1 Since the Cat and o2 sensors are very expensive I wouldnt want to change the part for nothing.

If readings from the front and rear oxygen sensors are the same this code will be stored in your Toyotas ECM. As the code description implies the Toyota P0420 code means that the vehicles control module has detected that the three-way catalytic converter is not working properly is not as efficient as the factory is expecting. The cats and airfuel sensors still have 200k miles on them so I expect to have.

Catalyst System Efficiency Below Threshold. The P0420 CODE IS INSUFFICIENT CATALYTIC FLOW FIRST CHECK OTHER SENSORS BEFORE REPLACING THE CATALYTIC CONVERTOR CHECK YOU REAR OXYGEN SENSOR TO MAKE SURE IT IS WORKING FINE THEN CHECK YOUR EGR VALVE MAKE SURE IT IS NOT LEAKING CHECK YOU MASS AIR FLOW METER IF IT HAS ONE OR AIR FUEL RATIO SENSOR THIS WILL BE THE TOP OXYGEN SENSOR. Code P0420 indicates that the catalytic converter is not functioning efficiently therefore increasing the output of harmful pollutants by your Toyota.

The only true way to tell if it is a bad cat would be to smog the truck. The p0420 code is insufficient catalytic flow first check other sensors before replacing the catalytic convertor check you rear oxygen sensor to make sure it is working fine then check your egr valve make sure it is not leaking check you mass air flow meter if it has one or. P0446Indicates that there is a fault in the evaporative emission control system.