2001 Volkswagen Jetta Stalling at Operating Tempature

The car was misdiagnosed and no logic was used. First of all, all the parts you listed didn't fail at the same time. Second, air and coolant temperature sensors have an extremely low failure rate because there is just one simple component inside them. Any fault code related to them should be treated with suspicion.

Most importantly, diagnostic fault codes never say to replace parts or that they're bad. They only indicate the circuit or system that needs further diagnosis, or an unacceptable condition. You must first perform tests on the wiring and connectors to rule out those things before settling on a part referenced in the code. This is especially true when there are multiple codes that likely have a common cause.

If there were misfire fault codes, those likely set some time ago and the Check Engine light should have been on. If you ignored that, the sudden stalling is likely a second, different problem. It's possible the ignition coil was responsible for those misfires, but worn spark plugs and wires would be a better suspect. If the Check Engine light wasn't on, the misfire code may have set while the cause of the stalling was occurring gradually over a few seconds. In that case, the codes would be erased, then you wait to see which codes set again later.

Dandy. Only Chrysler has been able to make an engine run right without a mass air flow sensor. Every other manufacturer uses that as the main measuring device for fuel metering calculations.

If all your mechanic did was overlook that connector, remember that people in every profession make mistakes. It's only mechanics that we hold to much higher standards than doctors. When a doctor doesn't get it right the first time, we keep going back, and paying and paying for each visit and test. Mechanics had better get it right the first time or we call them "incompetent", or "disreputable".

Happy to hear your issue is solved, and especially happy you were able to find it yourself.

Just to add to this one those coolant temp sensors do fail on those volkswagens its not uncommon I work on them everyday so I would know. Its not really uncommon for them to fail on other brand cars as well.I have replaced them on many different brands and they were bad.