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p0420

  1. Check engine light - P0420 error code

    Range Rover Sport / L320
    Got a check engine light come on the other day. Plugged in my IIDTool and it gave me a P0420 - catalyst system efficiency below threshold error. Need to add that I did a #7 resonator delete a while back. After some research I found that it could be O2 sensors or maybe an exhaust leak? I tried to...
  2. p0420

    Range Rover Mark III / L322
    I have a RR HSE 2008 with 101k miles on it. During a long drive (at the 9 hr mark of a drive with maybe 2 stops of 15 min each) the check engine came on. The code is p0420catalytic converter insufficiency bank 1. This is the 3rd time it has come on, all after several hours of driving. I erase...
  3. Code P0420 Catalytic Convertor

    Range Rover Mark III / L322
    My 2006 Supercharged has been throwing this code for the past couple of months. It indicates bank 1 catalytic converter, am I right to assume that this is the passenger side? Truck has 139k miles on it, has anyone tried welding in aftermarket units?
  4. P0420 & P0430 Catalytic Converters

    Range Rover Mark III / L322
    My 2008 Range Rover HSE is throwing codes P0420 and P0430. It appears that I may need to replace the catalytic converters. Has anyone used the Magna Flow universal high flow catalytic converters. This is a more cost efficient option than the dealers $3,000 quote.
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