Post piggie installation (top CAT material cleared, lower CAT left in place) and I’m throwing codes on the passenger side (both front and rear). Drivers side is not throwing any codes. I have “L” shaped O2 spacers on the lower sensors on both sides. Codes have been cleared a few times to make sure they were not temporary. Codes / Check Engine light come on after a while.
Codes
Passenger Side, Upper/Front - sensor part# 1K0998262AA
P2196 O2 Sensor Signal Biased / Stuck Rich (Bank 1, Sensor 1)
Passenger side, Lower/Rear - sensor part# 022906262BM
P0138 O2 Sensor Circuit High Voltage (Bank 1, Sensor 2)
P0141 O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
P0036 Heated Oxygen Sensor (HO2S) Heater Control Circuit (Bank 1, Sensor 2)
P0139 O2 Sensor Circuit Slow Response (Bank 1, Sensor 2)
I had a somewhat reputable VW/Audi place perform the work, but not sure I trust them 100%… I know it is somewhat common for the sensors to need replacing after doing piggies (broken wires, damaged sensor, change in exhaust flow from norm). The only work performed at the time was piggies.
So, what I’m wondering: I’ve read where the sensors were swapped, which causes problem - not sure if that is a possibility here with these codes. I’m getting ready to order replacement sensors - but I’m confused on the Bank 1, sensor 1 code outside of a damaged sensor. any thoughts?