I get a check engine light code PO420 which reads Catalyst System efficiency below threshold (Bank 1) A couple of times the engine ran rough when warm. Could this be a bad oxygen sensor or a bad catalytic converter?
My car also shows a symbol on the dash instruments when I step on the brake pedal. Does this mean the booster is low or bake pads are worn down?
My car also shows a symbol on the dash instruments when I step on the brake pedal. Does this mean the booster is low or bake pads are worn down?
Aug 4, 2008 at 6:32 PM