I have a 2022 Toyota Corolla and for the past month the engine stalls every time I stop at a red light. The weird thing is it starts right back up without any problem, but it's annoying. I already checked the spark plugs and the air filter is clean. What could be going on?
It's not exactly something serious, but that behavior shouldn't happen in a 2022 Corolla even with new spark plugs. Most likely you've got a problem with the idle sensor or the IAC valve (idle air control), which is what keeps the engine running when you stop. It could also be a matter of the car's software detecting something odd in the oxygen or pressure sensors, or simply that you need to clean the air intake more thoroughly than a visual inspection does. Best thing would be to hook the car up to a diagnostic scanner to read the error codes it has stored, because without that you're just guessing.
It's probably a dirty crankshaft position sensor or MAF sensor, which stops the computer from regulating idle speed properly. I'd recommend cleaning or replacing the MAF sensor first, since it's cheaper and more commonly the culprit. If it's not that, have your mechanic scan the error codes with a diagnostic computer, because without that you're just shooting in the dark. A 2022 Corolla is still under warranty, so if you take it to the dealership it shouldn't cost you anything.
This happened to me a while back with my old pickup truck when I'd come back from road trips, and it's frustrating because you don't know if you'll be able to start it again. In a 2022 Corolla, it's most likely a problem with the idle speed sensor or the engine control system. When you stop at a traffic light, the car should keep the RPMs stable at idle, and if it stalls it's because something's failing in that process. Since you've already ruled out the spark plugs and air filter, the next step would be to check the MAP sensor (intake manifold pressure) or the oxygen sensor, which often cause exactly this.
Another thing that happens pretty often is that the PCV valve or the emissions control system is dirty, especially if it started a month ago. I'd recommend connecting the car to a diagnostic computer so they can read the error codes, because even though the engine starts fine, there's definitely a code stored that'll tell you exactly what's going on. It's not something you can fix at home yourself, but it doesn't sound like something serious that would leave you stranded either. Take it to a trusted mechanic and ask them to do a full system scan before they start swapping parts without knowing what the problem is.
A 2022 shouldn't have that problem if you've already ruled out spark plugs and the air filter. Before you spend money on diagnostics, don't do what some people do: don't rev the engine in neutral thinking that keeps it running, because you're actually just masking the real symptom while you damage other stuff.
What most of the answers above point to about sensors is correct, but there's something missing: check your brake fluid first. It sounds weird, but a 2022 Corolla has a power braking system and if the fluid is low or contaminated, the vacuum sensor acts up and the idle drops. It's a 30-second check and a lot of mechanics don't even mention it. Then yeah, a dirty MAF sensor is the most common culprit in these cases, or the oxygen sensor if it's got higher mileage.
Now, if all that checks out, you need to take it to a shop with a diagnostic scanner because a 2022 Corolla has all the electronics and it's not something to be guessing about. It could be an error code stored in the computer that isn't throwing a check engine light yet. It's gonna cost you less than cleaning random sensors and you won't have it stalling out in the middle of the avenue again.
I had a car that did exactly that and it turned out to be the idle air control valve clogged, not just the MAF sensor - sometimes dirt builds up on the valve itself and the computer can't compensate when the engine is at a stop. It's worth having a mechanic check it before replacing sensors, because cleaning it is cheap and it often fixes the problem on a Corolla.
Log into answer.
