Q: I have a 06 Infiniti M45. The service engine light came on. Got the codes of p0420 and p0430. Wondering if I need to replace both O2 sensors.

asked by on

Engine diagnosis got codes p0420 p0430 will changing o2 sensors remove engine light don't wanna do expensive cat converters can't afford the work. Car is driving fine ( no hesitation no hard shifting) i haven't had no work done recently either

My car has 119000 miles.
My car has an automatic transmission.

Hi there. When the codes P0420 and P0430 come up, usually the catalytic converter has failed, but before you determine if you need to replace the catalytic converter, consider checking the following:

  • A damaged or failed oxygen sensor on the exhaust system
  • Wiring damaged to an oxygen sensor
  • Engine coolant temperature sensor is not working properly
  • Leak in the exhaust system
  • The oxygen sensors are having the same readings
  • Spark timing is retarded
  • Leaking fuel injector or high fuel pressure
  • One or more cylinders are misfiring
  • The engine oil is contaminated

If all of the areas above are met and working properly, then the catalytic converter would need replaced. The codes are on as the Oxygen sensors have picked up the activity of the catalytic converter is below threshold. If you need further assistance with your check engine light on, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I have a 06 Infiniti M45. The service engine light came on. Got the codes of p0420 and p0430. Wondering if I need to replace both O2 sensors.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Q: My AC

The evaporator is freezing up due to over-cooling. There is a thermistor on the evaporator (behind the glove box) whose function is to prevent the surface of the evaporator from getting below 32F and icing up. It should be cycling...

Q: My chevy venture is pulling up a po420 code but we can't seem to find out why ?

Diagnostic Trouble Code P0420 has many, many potential causes including a damaged muffler or leaks in the muffler, damaged exhaust manifold or leaks in the exhaust manifold, damaged exhaust pipe or exhaust pipe leaks, misfiring in the engine, oil contamination...

Q: Check Engine Light P0430

Hi there. There may be two possibilities here for the P0430 code. The fact that the new bolts were installed can cause the computer to read differently so it may just need to adapt and reset. It is also possible...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...