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I have a 5-speed 2020 Versa S with ~26k miles that I've owned since new, and for the past few months I've been having some weird issues that have me stumped. Occasionally after warming up, the car will struggle to idle when sitting in neutral. Rpms will oscillate between 400 and 1200, and the oscillation will gradually get worse until I either start driving away, or the car eventually stalls out. While driving, the car basically acts normal except that I seem to have a bit less power at WOT, but this change is very subtle. On days when the car acts like this, it will eventually throw a P0101 MAF code, and will sometimes also trip a number of body control codes all at once (see pics).
The crazy part is that this only happens about 10% of the time! Most of the time the car acts totally normal. It seems to happen at complete random: there's no correlation to time of day, A/C on/off, lights on/off, etc. If I let the car sit for about 20-30 mins, it almost always acts normal afterwards.
Since I still have several years on my warranty, I tried taking the car to the dealership to see what they thought, but of course the car acted normal on that day. The dealer followed the procedure in TSB NTB21-049 (see here: https://static.nhtsa.gov/odi/tsbs/2021/MC-10199172-0001.pdf) which appears to describe my exact issue. They tested the battery, and it allegedly passed their load test. They then performed idle air volume learning, which changed nothing. They also claimed that I should pay $300 to have my throttle body cleaned, which I'm calling BS on for a car with 25k miles running a Wix air filter that I installed at 20k. (off topic: what's the point of a factory warranty if I'm going to be charged $300 for service that I shouldn't need?)
From my point of view, everything is pointing to either a battery or grounding issue. I should add that according to my OBD reader, oftentimes battery voltage drops as low as 11.7-11.8V while idling. I've confirmed via a multimeter that the resting battery voltage with car off is typically ~11.9V, which seems low.
Should I just drop the $120 on a new battery and see what happens? Should I go hunting for grounding gremlins? All advice is appreciated!
The crazy part is that this only happens about 10% of the time! Most of the time the car acts totally normal. It seems to happen at complete random: there's no correlation to time of day, A/C on/off, lights on/off, etc. If I let the car sit for about 20-30 mins, it almost always acts normal afterwards.
Since I still have several years on my warranty, I tried taking the car to the dealership to see what they thought, but of course the car acted normal on that day. The dealer followed the procedure in TSB NTB21-049 (see here: https://static.nhtsa.gov/odi/tsbs/2021/MC-10199172-0001.pdf) which appears to describe my exact issue. They tested the battery, and it allegedly passed their load test. They then performed idle air volume learning, which changed nothing. They also claimed that I should pay $300 to have my throttle body cleaned, which I'm calling BS on for a car with 25k miles running a Wix air filter that I installed at 20k. (off topic: what's the point of a factory warranty if I'm going to be charged $300 for service that I shouldn't need?)
From my point of view, everything is pointing to either a battery or grounding issue. I should add that according to my OBD reader, oftentimes battery voltage drops as low as 11.7-11.8V while idling. I've confirmed via a multimeter that the resting battery voltage with car off is typically ~11.9V, which seems low.
Should I just drop the $120 on a new battery and see what happens? Should I go hunting for grounding gremlins? All advice is appreciated!
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