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Ignition Coils Keep Failing....:-(

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sorry. basically what happens is the car cuts out all the time. got the codes read sayin that cyl 3 & 5 misfiring. i have changed the coils no end of times and its starting 2 do my head in!. i bought the coils from japarts which are not genuine lexus coils but they say just as good.

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What are the codes exactly, P0303 and P0305 ? No more ?

The coil packs failing is just one of many possible causes of a misfire. There are loads of other possibilities. The coils are obviously fine if you've changed them all and are still getting the same problems.

How about the spark plugs, are they ok ? Have they been changed ? The injectors could be faulty, could be valve problems, lack of compression in those cylinders due to damage, electrical problems, fuel issues, etc, etc.

When did the problem start happening, had some work been done on the car shortly before then ?

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