B5 S4 hesitation after 4K revs

Hi was wondering if anyone could help I'm having some issues with my B5 S4 (running ko4's and mapped by MRC Tuning)

I took my S4 out and it started holding back at around 4K revs and splutters all the way to redline.

I plugged vagcom in and got a few codes,



Now I reset them and done a throttle alignment the car didn't like this at all the accelerator stopped working properly, took the car out and it would accelerate very slowly felt like a loss of all power and codes wouldn't clear.

Left it a week came back to it today and at first it was doing the same thing then after 2mins of driving all hell broke lose and the power was back, I checked the codes reset everything took it for a drive and got these come back



Cleared that and took it for another drive and got a fault for Oxygen (Lambda) B1 S1 No activity but I was watching the sensors in measuring blocks and they where working as they should be.

Then I reset it again and went for a long drive came back and only have this left now,



Now could this be causing a erratic idle and the holding back issue? Car starts fine when cold and when hot.

Any help would be much appreciated thanks



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aragorn said:

certainly looks like it could be a bad crank sensor.

The throttle codes wont go away for ever, they will return and it indicates the accellerator pedal is broken. I've seen that before caused by water leaking in by the ECU box and dripping on the sensor.

The lambda code also suggests the lambda sensor is tired, so i would get that replaced.

Click to expand...

Yeah I've seen other people have a issue with the water in the plugs so I'm going to check that out today and lambda will be on the order list! Just didn't know if the crank sensor would cause the issues I'm having


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