Questions & Answers for: Mercury p0420

1999 cougar diagnostic code p0430 and p0420 I have a 1999 cougar 2.5 litre I have 2 codes po430 and p0420 the car is using alot of fuel, what will cause this. Thank you. Willie Failed or faulty oxygen

99 mercury cougar wont idol until car is warm p0420 codes came up i have a 99 mercury cougar it is fairly cold and the when i go to start the car in teh morning it starts fine and idols fine but about

...bad wires and plugs anything that causes a misfire. P0430 is bank 2 converter(drivers side) P0420 is bank one(passenger side). There are 4 o2 sensors, 2 per side. Swap all sensors side to

code p0420 says cat system below threhold P0420 - Catalyst System Efficiency Below Threshold (Bank 1) The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and ...

engine light stays on, code is p0420 low thresh bank 1.... where is bank 1 located I'm not sure you understand the difinition of OBD2 fault code P0420, it means that Catalytic converter in the ...

...po420 po306 for mercury cougar 1999 P0430 code is(catalyst efficiency below threshold on bank 2)P0420 code is((catalyst efficiency below threshold on bank 1)P0306 code is(cylinder 6 misfire ...

Check engine light is on for a2001 mercury villager p0420 it is a code for the cat converter is not working properly there is a guy on y tube showing how to clean it but i have never tried it or ever ...

whats p0420 catalyst system efficiency below threshold bank 1 for a grand marquis 2004 Trouble Code: P0420 Catalyst System Efficiency Bank 1 Below Threshold Possible Causes: Air leaks at the exhaust ...

1999 mercury grand marquis L's I ran a code and said p0420. What do this mean.. Failed Exhaust Converter-right side TYPE: OBD PO420 & read up on it

How do I know what the code 0420 ean when engine light is on. P0420 catalytic converter http://www.obd-codes.com/p0420