So I've got a bit of a weird problem judging by the fact that I get no search results. On my 01 allroad with m-box flash I can connect read the rom(with chinses fidi cable and mpps), connect with me7loggger, connect with vcds, connect with obdii reader with the key on but engine not running. Once the engine is running I get none of that except for my elm 237 bluetooth. Also I have a very low rate of success flashing in the car, I basically just have to bench flash. Additionally but maybe unrelated I randomly get codes for the sensors driven off the fuel pump relay(egt, n80, o2 high internal resistance), I just replaced it even though the contacts (inside) looked brand new and it made no change.

Yeah I was already half considering running my own kline wire and putting a ferrite choke on it.

My weirdness continues. Hooked my scope up to the power leads to the ecu with the car running, 0.34v of noise in the DC voltage that shouldn't cause a problem. And I can finally get intermittent connection to the ecu with the engine running with obdeleven, enough to discover that the ecu always thinks the throttle angle and load are 0, it also commands 0 duty cycle for the n75. Maf reading is like 5g/sec cruising and 20g/sec at WOT and maf voltage barely crests 1v. Unplugging the maf doesnt change the throttle plate angle always being zero issue. I guess this explains why I never got codes for boat deviation while only seeing 4psi on gauge since it's never commanding more than that. I confirmed that the car has a Hitachi maf and that the previous owner didn't do something dumb.

Right?! The only thing on my tune is rs6 egts, soft launch rev limiter, left foot braking, and raised top speed limiter. It's otherwise a completely stock 551M-0001 tune. I'm going to try flashing the original allroad tune back on it and see if I get everything back except the egt being pissed off.

*Edit, no joy with the factory flash either. I did confirm that the ecu is reading different voltage than the maf sensor is outputting. With on scope on pin 4 of the maf I had 0.7v idling and got it to like 1.5v holding the revs in neutral, at the same time measuring block 39 reported 0.4v and 0.7v respectively. Also still only 0% load and 0* throttle angle in like measuring block 3. But like obviously it drive like it drives fine, just like you unplugged the N75. I confirmed that the maf is getting 14v and 5v and the sensor ground is grounded, not amazing though, its 4 ohms to the battery terminal from the maf connector.

I can hear the throttle plate stroke out both directions when the car is off. I'm pretty much out of ideas here and very confused why the only codes in the whole car are in the cluster for missing communication to the air ride module (because delete) and no radio communication.

To bump this back up I have an update. I fixed the cat being slow, it achieves target boost now. The 4 pin temperature sensor connector was broken by the PO and I finally replaced it, that's all I changed. What's weird is that with the broken connector completely unplugged it would throw a code, but with the broken shit jammed into the sensor no code, no weird temperature readings on obd11. Now I need to attempt to log with me7logger to see if this somehow fixed that issue and my flashing in thy car issue too.

I've got to try connecting it again now that I've replaced the connector, but before VCDS refused to connect to the car when the engine was running.