Limp mode, codes for all 02 sensors-- anyone have any thoughts what could cause this?

[Obioban]

Driving along, ~75% throttle at ~4500rpm, (quarter tank of gas), then BAM limp mode.

Pulled codes, and have...
Lambdasondenhzg. 1 nach Kat (lambda sensor heater 1 after cat)
Lambdasondenhzg. 2 nach Kat (lambda sensor heater 2 after cat)
KAT-Schutz aktiv bei leerem Tank (CAT protection active when the tank is empty)
Lambdasondenhzq. 1 vor Kat (lambda sensor hzq. 1 before cat)
Lambdasondenhzq. 2 vor Kat (lambda sensor hzq. 2 before cat)

Seems exceedingly unlikely to me that all my 02 sensors failed at the same time. Anyone seen this before/have any idea what could be causing this?

Reset codes and it all came back next drive.


edit: resolution in post #5

[oceansize]

DME overheating? Maybe that fan died and after driving get multiple codes.

[IamFODI]

Damn. That sucks.

Bad batch of gas? Refill, let it sit, reset adaptations, and try again?

[heinzboehmer]

Maybe the fuse for the O2 heaters blew? F4 in the engine bay.

I would check grounds in that area too. Especially the one right by the brake booster.

[Obioban]

Maybe the fuse for the O2 heaters blew? F4 in the engine bay.

I would check grounds in that area too. Especially the one right by the brake booster.

This is what happened. Seems one of the post cat 02s has an internal short, which blew that fuse, making all 4 show up as failed.

My car is registered as a classic, so I don’t need to pass emissions— so I weight saved the sensors, coded the errors off, replaced the fuse, and all is well again.

[heinzboehmer]

Nice, glad it was a quick fix.