So, a little while ago I replaced my G42 sensor. It's the combined Boost and charge temp sensor that sits in the top of the throttle body boot (B5 S4). I did this because it appeared to be at fault. Engine was intermittently reading 143 degrees charge temp....even at idle and with the engine off. Then it went to reading it permanently. Anyway, changed the sensor, and the problem went away! Until now..... And it's come back.... Almost permanently! You'll be driving along, and suddenly get a massive surge of power. Or go to pull out of a junction and almost totally overshoot it, because suddenly the sensor is reading right, and the car's at full power. It's absolutely frustrating to the core. Other than thinking it's a wire that's gone high resistance, or is shorting somewhere....what else could it be? I've had the Y pipe off today, and checked as much of the wire as I can, which isn't much as it's all 'loomed' in with everything else. And I can't see where it might be broken/chafing/high res. Anyone had this before? How did you fix it?