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I'm not sure you understand the difinition of OBD2 fault code P0420, it means that Catalytic converter in the exhaust that is connected to the engine cylinder bank that contains number one engine cylinder has fallen below the a allowed threshold of cleaning pollunts from the engines exhaust stream. I would be more specific but you have not given model or year of the Mercury you have.
Here is the full difinition of OBD2 fault code P0420 from the factory service information system.
P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
- Three way catalyst converter worn out - Intake air leaks - Fuel injectors may be faulty - Fuel injector leaks - Spark plugs may be faulty - Improper ignition timing - Engine Control Module
flepper2009, If your car has 19mm lugs on the wheels then the recommended torque is 100 ft/lbs. If they any other size then I don't know because it will vary between vehicles. Sorry if this doesn't give you a difinitive answer. Good luck with this.
check all fuses and the ignition relay.. but by reversing the polarity you have probably damaged the e.c.u or the other essential electrical equipment so get the motor to a auto electricians nobody will be ablle to give you difinitive to what is blown from other side of p.c ..
I have had this problem more than a few times. First you need to connect the negative cable last and when you do, try to connect it fast. For some reason if the connection sparks it doesn't seem to work that well. Second when you do connect it, go right into the vehicle and put the ignition key to the on position. Press the power button and the Code In should appear. I don't know if you have the CD changer in the back although I have had problems with that too: Sometimes It dose not work properly after a reconnection. What I have done is unplug the CD changer cord from the changer until it works. For some reason its a pain in the ****, but if you keep at it it should turn on. Just remember that you have to have the radio on when your doing it.