Hi I have a 2003 mitsubishi lancer and the main computer ECU its damaged i need to replace it but the one that i need its too expensive the one i have in my car its MR988328. whats the diference between mine and MR988329 OR MR988331 OR MR988333 Tthese are cheaper than mine and the description says same year and model...
Honestly no idea ,you would need some dealer only information and doubt they will tell you but do a shrewdy and ask in the stores what the difference is ..
SOURCE: Mitsubishi Lancer OZ Rally 2003 hesitates while driving
before anything i had the problem and this is the way i solved it ... the lancer has 2 ignition coils in 2 cylinders what you do is take the iginition coil out of the cylinder that is misfiring and change it to another cylinder and put the car on the odb reader again it should change location of misfire .. then that would tell you that its the ignition coil thats bad i ended up getting my coil at the dealer for $110 ebay has some aftermarket pairs for $100 so you can get 2 now for the price i paid for 1 that will solve the problem guaranteed owne d a lancer for 5 years know the ups and downs to them
dirtyjerz908 at GMail.com hit me up
SOURCE: 2002 mitsubishi lancer oz rally troubleshooting
Code p0420 is 'catalyst efficiency below threshold'.
This could be caused by a bad catalytic converter but before dumping a ton of money on that I would suspect the after-cat oxygen sensor is getting lazy and setting the code.
Have the O2 sensors checked and replace if needed before suspecting the catalytic converter.
Good luck.
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