A few years ago, my 2008 Mini Cooper S R56 N14 engine was rebuilt (forged pistons, valves, timing chain, coil packs, MAF sensor). I don’t drive it much. Battery was replaced in November. The car is catless, has a larger intercooler, 1‑step colder plugs, and an AEM intake. It’s tuned, and the only recurring code I normally get is:
- 2B5F — DME: Air mass sensor, correction signal

Yesterday I went for a Costco run and then to the mall. While driving, I got these codes:
- 2D8E — DME: Knock sensor, electric
- 2D50— DME: Super knocking

The car went into limp mode for a few minutes, then recovered and drove normally. Later, at a downhill stoplight on the way home, the car shut off without me noticing. When the light turned green, I tried to accelerate and realized the engine was off. It would crank but not start. Since it’s a manual and I was on a downhill, I tried bump‑starting it — nothing. Had to tow it home.

I recharged the battery, but it still only cranks and won’t start. I have a basic OBD2 scanner (Xtool) and captured some data during cranking. Before this issue, maybe 1 out of 5 starts would crank longer than usual, but it always eventually started.

Right now I’m not sure if this is: High‑pressure fuel pump, Low‑pressure fuel pump, Bad JBE module, or something else entirely.

Any ideas on how to test these with limited tools?

 

To help member focus on you, I highly recommend that you start your own thread on this topic.