Check engine light

Talked with my wife and he had a I pad and did not plug anything into the van he put some numbers in and then said here see its the radio.then took van around to the side and came out and plugged a different tool in wife did not see what he did.talked to my mechanic who is a mopar mechanic of 30+ years he said to bring to him to check first. I have the 100,000 mile bumper to bumper extended 100.00 deductibles warranty. So far only paid once I refused to pay last two times. Bill was 300.00 first two times and 1,200 last time. Some valve first two and fuel tank last time.