During my last roadtrip when I was driving at about 80mph on the highway (75 speed limit) a pressed the brakes abruptly after being cutoff by another vehicle, then my MIL came on. When I checked the fault code with VAGCOM it said:
17522 - Oxygen (Lambda) Sensor: B1 S2: Internal Resistance too High
P1114 - 35-10 - - - Intermittent
(2002 VW GTI 1.8T, 67k miles odometer)
I reset the code and the light stayed off, but ever since that incident, now when I reach about 70mph on the highway (and sustain that speed for about 30 seconds) the MIL comes back on again. After a day or two the MIL turns off automatically and remains off until I exceed 70mph again (same fault code).
I have reproduced this problem 3 times. As long as I stay below 70mph on the highway, then NO fault code appears. I don't notice any strange behavior or decrease in performance, but I'm now staying below 70mph until I can figure this out.
Is this more likely an issue with the wiring/harness or the O2 sensor itself, or possibly something else entirely?
Thanks for the help.