It wouldn't peeve me any more than when my husband notices a low tire on his car, stops and adds air, and then goes on his merry way---never saying a word to me (or anyone else) about it. Then 3 weeks later, when he goes out to the garage to get in his car to go to work, he has a flat tire, and starts stressing about getting it changed or taking my car (leaving me stranded) etc etc etc...
This has actually happened more than once. The last time, he drove it too long without getting the nail pulled and patched/plugged (combo), that he damaged the tire from running it slightly underinflated, and we had to buy a new tire. We just put new tires on his car less than 6 months ago. So 2 weeks ago, we spent another $165 dollars to buy another tire.
All the while, he is calling asking if they will have it done in time for him to have it to go to work.
Umm.. hello... how about, when you notice ONE tire is low, you air it up, then on your day off (every Friday he is off) take it and get it taken care of. ONE tire isn't a change in the weather. It is 99.9999% guaranteed that it is a nail. And it will go flat when it is least convenient if you let it go and worry about it "later".
Ugh.
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oh... and as for the service engine light, I wouldn't worry about it either way. A lot of the time it is simply a gas cap not put back on all the way. And if not, then some sort of sensor that probably is irrelevant (at least in my experience). An O2 sensor will cause it to come on, but I think that a bad O2 sensor can really screw up your gas mileage, and you would notice. I have had a service engine light glowing on my dash for several years now. There is nothing wrong with the car. I actually had them run basic diagnostics on it and they found nothing. It used to randomly go on and off for a while. Then it just started staying on. Personally, I think it is the "up to 10% ethanol" they require us to use these days. For awhile, only certain stations/brands of gasoline seemed to cause the light to come on, and if I filled up at other stations it would go off. But now, it doesn't matter where I get gas. So you tell me.
I wouldn't worry about the service engine light. If it was something serious, they would have noticed it when he had it in a few weeks ago. He could have driven it to the funeral. We just took my car (with the service engine light glowing cheerfully) on vacation to the mountains. Put about 1500 miles on it. Still chugging along just fine.... turned 270,000 miles this week! woot!