On a 2009 Mini Cooper New OEM catalytic converter and exhaust manifold still getting p0420?

I just replaced the catalytic converter and exhaust manifold with new sensors on a 2009 Mini Cooper Base model automatic I am still getting P0420 what else can cause p0420 on a mini cooper other then catalytic converter and exhaust manifold?

1 Answer

Relevance
  • 2 months ago

    P0420 MINI Possible Causes

    Faulty Three-way Catalyst Converter Bank 1

    Exhaust Tube

    Intake Air Leaks

    Faulty Oxygen (O2) Sensor

    Faulty Fuel injector(s)

    Leaking Fuel Injector (s)

    Faulty Spark plugs

    Improper Ignition Timing

    Faulty Engine Control Module (ECM)

    Dirty Air Filter

    • Log in to reply to the answers
Still have questions? Get answers by asking now.