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Well, I don't think it has anything to do with the code but i would steer clear of someone that calls himself a mechanic that made that mess. Are the 2 sensors before or after the cat?
If they are before the cat that hole he blew through the closest one could cause P0172. I wonder why he didn't just put a bolt in the bung.
The design of O2 sensors actually allows a flow of air from the top where the wires are to the exhaust flow. A big hole like that could let too much air in.
The two sensors in the photo are after the flex pipe, before the cat. The downstream sensor is mid lower area.
That mess is the most likely problem. Either have a new section installed or get a new cat. New cats run $100-$600, shop around.
I suggest this type of repair, other options and prices are available: https://www.ebay.com/itm/11251165694...QAAOSwGeBXPkXd
And I just bought a fuel tester so this will be my next thing to check. I’ll follow up with what results I get out of it.
Good move! But of course you’ll also check the stored ethanol %, right? It’s cleverly hidden in the menus of some inexpensive scanners, not available in others. Most of the parts stores can read it, even if they think they can’t; they might need to work at it.
I am far from predicting erroneous stored ethanol % in every case of P0172, but that’s the case, you want to know about it early. On member here replaced half his fuel system before I was able to badger him to do this and, Eureka! That was (at least part of) the problem.
If you do have this problem, you of course still need fix any exhaust and emission system problems and any other issues that may contribute.
