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could be the timing belt
crankshaft seals failure
The cam belt should be changed on a Mitsubishi Triton diesel engine when it becomes worn down. If it wears down too thin, it can break and cause driving issues.
After repairing the cause of the code, you clear the code with a scan tool.
Your 2002 Mitsubishi Lancer requires conventional 5W30 oil. This applies to all options, including the 2002 Mitsubishi Lancer Evolution.Always check your owner's manual or the sticker on the inside of your hood to be sure of the recommended oil type for your particular engine. Using the wrong oil could cause engine damage.
Dead battery, bad starter, or defective ignition switch.
Front engine seal?
You may think there is nothing wrong but there is. If the check engine light is on there will be codes stored in the ECM. Have the codes read. The codes will help you determine what the cause is.
If you have coolant in the oil, it will cause the rod and main bearings to fail.
It is probably the lifters. I suggest using an engine flush and I have had luck with GUNK. Follow the directions on the can. You may have to do it every 30000 miles . I found that if I put a non Mitsubishi oil filter on my pu would start making that ticking sound
Pennzoil's Lube Match says that Mitsubishi recommends 5W20 oil for its 2009 models.Always check your owner's manual or the sticker on the inside of your hood to be sure of the recommended oil type for your particular engine. Using the wrong oil could cause engine damage.
An engine knock ia almost always very serious. Stop drivng this car and take it to a professional. Not a repair for a novice.