Question about 1999 Ford Taurus
CODE PO420 CATALYST SYSTEM EFFICIENCY BANK 1 BELOW THRESHOLD. POSSIBLE CAUSES AIR LEAKS AT THE EXHAUST MANIFOLD OR IN THE EXHAUST PIPE. CATALYTIC CONVERTER IS DAMAGE CONTAMINATED OR IT HAS FAILED. ECT -CHT SENSOR HAS LOST ITS CALIBRATION THE SIGNAL INCORRECT. ENGINE CYLINDER MISFIRING OR THE IGNITION TIMING IS OVER RETARDED. ENGINE OIL IS CONTAMINATED. FRONT HO2S OR REAR HO2S IS CONTAMINATED WITH FUEL OR MOISTURE. FRONT HO2S AND OR THE REAR HO2S IS LOOSE IN THE MOUNTING HOLE. FRONT HO2S MUCH OLDER THAN THE REAR HO2S HO2S 11 IS LAZY. FUEL SYSTEM PRESSURE IS TOO HIGH CHECK THE PRESSURE REGULATOR. REAR HO2S WIRES IMPROPERLY CONNECTED OR THE HO2S HAS FAILED.
Posted on Jan 02, 2011
Bank 1 catalytic efficiency is below threshold
Need catalytic converter
Hope this helps, it it does please leave feedback Thank You and Good Luck
Posted on Jan 01, 2011
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Posted on Jan 02, 2017
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