Hello and thank you for taking a look at my problem.

I have a 2002 V70 XC with a BOSCH ETM. The car has 180,000 miles.

Last summer, on a road trip. I stopped at a truck stop, when I went to started the car again it threw fault code P2111 and was in "Reduced performance" mode (This was the first time I had it do this). After turning the car back off, and waiting 10 minutes. It started fine and all of the warning lights went out.
About a month later, it did it again. As time passed, it started doing it more frequently. About a month ago, it was doing it so frequently, that I couldn't drive it unless I took my fault code reader to clear the fault code in order to start the car again.

NOTE: It only does this when the engine is HOT. In the morning, it starts fine. No codes. If I go somewhere and try to start it again. I have to wait for it to cool down or clear the fault code with my fault code reader in order to start again.

After doing a lot of reading and seeing what seemed to solve other peoples issues with the same bug. I did the following:

1) Cleaned and inspected the ETM. It is a BOSCH and mechanically, appears to be in good working condition. It was surprisingly clean. However, it did have a lot of oil residue in it.

2) New spark plugs (they needed replaced regardless).

3) Replaced the accelerator pedal with a used one.

4) Replaced the MAF sensor.

In the last few weeks, the MPGs have dropped dramatically. Not sure if it is related or if it is just the fact that winter is in full force. Gas mileage seems to always plummet in the midst of winter.

I bought this car last spring with 168,000 miles for a song because it needed a lot chassis maintenance. So I have no idea if it has had any software upgrades or anything else.

Any comments or insight would be appreciated.

 

Curious if you always use the same brand and grade of fuel.

Winter blends do reduce MPG in most cars in states that mandate changes.

But, I also wondered if you are using a fuel that isn't a good blend or has some contamination in it.

I say this, because just last week, someone I know driving a brand new car, got a strange Service light after refueling. She took it back to the dealer, because the car was so new. They found diesel fuel in the gas tank.

My last idea is water in your fuel. Most gas treatments can dissolve the water to help get it out. The car can deal with it at high throttle settings, but choke on it at lower RPMs.

 

You have a bad throttle body. You can clean it to the point where it is sterile enough to use in a hospital setting, but the electronics inside are bad.

Stop wasting time. Replace.