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?

2 Answers

  • 6 months ago

    FIRST you must use ONLY EUROPEAN FULLY SYNTHETIC OIL called LONG LIFE -03 oil,or the main sensos can clog up with soot, sludge, wax, and TAR. Try cleAning the THROTTLE BODY and PCV HOSES With AMSOIL POWER FOAN to remove any of these harmful unwanted additions. You should be on your way! ALSO use DENSO TWIN TIP IRIDIUM spark pugs in there to gain more power and exhaust life! I LOVE PENNZOIL PLATINUM or EURO cause ot comes with a 500,000 mile additional warranty against engine damages

  • 8 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

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