LOL. You will not believe how many times I noticed some "questionable" repairs on used cars I purchased over the years. I go under the car to fix one thing and notice a half-ass repair on some other part of the car. Believe it or not; many professional mechanics also performed repairs like that because many owners will not ever look under the car or know what to look at even if they did.
Do you think every repair shop will put on a new lower timing cover if they made a mistake like I did while changing the oil sensor if a used lower timing cover with a minor defect will work? They would slap on the used cover and get the car back on the road if it does not leak. I would not have not known the wiser if I paid shop to replaced my lower timing cover and they used the same exact cover I have with the chip as the replacement.
All I would "maybe" know is that they was able to source me a used lower timing cover that worked.
Storytime...gather round'..
Not too many years ago I took the wife's RX350 in to a local, reputable shop for an alternator replacement. It went relatively smoothly, although it did take longer than expected and a refurbished part was used instead of new.
Fast forward a few months and I noticed an oil leak on the garage floor. Now in the year prior I had the engine oil cooler lines replaced (known issue, rubber fails and revised part is metal). So I took it back to the Lexus dealer to check the lines.
They called to let me know that it was not my engine oil cooler lines, but that my new radiator was leaking at the nipple and it needed replaced. It was ATF fluid after all. The car was 13 years old, so it came as some surprise to me that it needed a *new* radiator replaced.
We went back and forth a little but they insisted that was indeed the problem, defective radiator. I put my peepers on it and low and behold, my car had a new, non-OEM radiator in it. Well considering that I only had it at Lexus dealers prior to the alternator replacement, and the obvious lack of Al corrosion in a salt state, it didn't take much to figure out that the only window of opportunity was during that same alternator replacement. And it lined up with the extended repair time-line, so I called the shop.
Well the manager there insisted on the phone that they had no part in that radiator swap, never in a million years. He talked so much he almost, almost had me convinced. I took the car back to the scene of the crime anyhow and the guy would barely look at it as I pointed out the non OEM "tells" & newness. He had to admit it did look new, and managed to mumble up an offer to refit the hoses for $130.
I thanked him and left. I called back the next day, and asked to speak with the owner. The manager tried to dissuade me and even intimidate me from doing so. But I persisted, and did speak to the owner. I told her the short version of the story, and she also insisted that they would never do anything like that. Unheard of. Nope no way, never ever.
I acknowledged her position, shared that I too was surprised to be in this situation, and all I asked is that she check into it with her people and get back to me, because I could not come up with any alternative explanation.
The next day I got a call from manager. His tone was markedly different this time, but yup, it was him. Same guym. Not only did he confirm that they replaced the radiator, but he himself ordered the part. He was very, very apologetic. Couldn't for the life of him figure out how he forgot all about it, but hey, there we were.
To make a long story ever so slightly shorter, the Lexus dealer installed a new OEM radiator, and the shop that swapped the old one cut me a check for the full amount.
Live and learn. If you know what to look for after a repair, take a good look after each and every one.