Code P0420

Good afternoon,

The 420 is a catalytic converter code. The converter needs to be replaced. It has nothing to do with the current issue.

You need spark and fuel to run.

The fuel pressure needs to be checked.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Spark needs to be checked as well.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Roy

Code 420

P0420
Descriptor
Probable Causes
Catalytic Converter
Catalytic Converter Damaged
Catalytic Converter Restricted
Diagnose Other DTCs First
Engine Misfire
Engine Oil or Coolant Consumption Excessive
Exhaust Leak
Exhaust System Components Loose
Exhaust System Damaged
Exhaust System Hardware Missing
Fuel Mixture Lean
Fuel Mixture Rich
Heated Oxygen Sensor (HO2S) 2
Heated Oxygen Sensor (HO2S) 2 Damaged
Heated Oxygen Sensor (HO2S) 2 Loose
Oxygen Sensor (O2S) or Wiring Harness Damaged
Pigtail or Wiring Harness Contacting Exhaust or Any Ground
Spark Timing Retarded
Weak or Poor Spark

How did you determine that? It will not cause the overheat but could be the reason the catalytic converter failed.

Roy

Check engine light does not tell you anything but an area of failure, not the part.

203 is for the circuit indicating a wiring issue.

Roy

203

P0203
Descriptor
Probable Causes
Diagnose Other DTCs First
Fuel Injector 3 Malfunction
Fuel Injector Control Circuit Open or Poor Connections
Fuel Injector Control Circuit Short to Ground
Fuel Injector Control Circuit Short to Voltage or Another Circuit
Fuel Injector Control Circuit Short to Voltage or Open
Fuel Injector Ignition Voltage Circuit Open
Multi-Way Connector Poor Connections
Powertrain Control Module (PCM)
Powertrain Control Module (PCM) Harness Connector Poor Connections
Wires Inside Insulation Broken
Wiring Damaged or Pinched