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I have had a lot of problems with my 240 dealing with the check engine light. But after much pain I have determined the easiest solution is to start replacing parts. When I give up and take it to the pro mechanics that is what they do everytime. So here is what I would do.
1) Disconnect the negative ground cable to the battery for 5 minutes to reset the computer. Also if you have a Haynes or other manual follow their steps for resetting the computer. Then take the car for a test drive and see if the check engine light comes back on. You need to this because the computer can turn on the check engine light from a temporary situation. If it comes back on- continue through next steps.
2) I know you just did a tuneup 6 months ago, but do it again. I recently had your problem (check and see if my previous post is still in Opinions). It turned out that I had bought poor quality replacement parts. So change your spark plug wires, spark plugs, distributor cap/rotor with OEM parts- Bougicord spark plug wires, Bosch on rest. I have found out the hard way that using non-OEM causes problems especially with the spark plug wires.
3) Clean your throttle body and flame trap.
4) You may be able to carefully clean up your O2 sensor by removing and blowing out with compressed air. But if it has more than 30-50k miles, replace it. You probably have already damaged it.
5) I would bet the above will solve your problem. Although it will involve replacing parts ($$), but it will save you from the big repair bill from your friendly mechanic.
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