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  1. How to replace catalytic converters for P0420 and P0430 error codes

    Engine Performance
    Hi. 2007 FJ 4WD w 160k miles error codes P0420 passenger side and P0430 driver side codes came up. Catalyst inefficiency meaning the catalytic converters were no good. Ran cat cleaner through the gas tank and no change. Dealer wanted 4g for new cats including install. I paid $750 total. 2...
  2. Drove til batt dead, now P0420 & P0430

    Maintenance Tech
    My alternator died and I drove home with a dying battery. I drove it until it died and I coasted it into the driveway. I replaced the alt and battery, no problem. However, now I'm getting P0420, P0430, and c1201 codes. Could I have damaged the cats by driving with a dead battery? Or, are the...
  3. MAF p0171 and Catalytic p0430 error codes

    Engine Performance
    I used to run K&N filters in all my vehicles so putting one in the FJ was just a normal "mod" till my MAF started throwing codes on my Torque+ App. A little research and out came the K&N, removed and cleaned the MAF with MAF cleaner spray, reset codes... still threw an error after about 50...