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1997 volkswagen Passat

My check engine light is blinking. I already changed the spark plugs and wires. I also recently changed the alternator. what can it be

It could be dozens of things. Take the car somewhere and have the codes read. Then you’ll have some idea where the problem is. Stop throwing parts at it.

Many parts stores will scan the computer free.

By the way, if the light is blinking there is a critical problem. Check your owner’s manual. It may advise not driving the vehicle.

That CEL (check engine light) is just a kid in class waving her hand trying to get you attention because she has the answer. You need to have the codes read. Some places will read them for FREE. Try Autozone or Advanced Auto Parts. Get the exact code (like P0123) not just their translation into English and post it back here.

Regarding warning lights:

  1. if the coolant temp light comes on, shut off the engine ASAP

  2. if the oil warning light comes on, shut off the engine ASAP

  3. if a FLASHING MIL/CEL comes on, shut off the engine ASAP

    ASAP means driving to the berm of the highway right now and not waiting for the next exit.

But if the MIL/CEL is not flashing, then it’s not an urgent indicator.