I have a 95 benz s320. I changed the o2 sensor and the mass airflow sensor like two months ago and the check engine keep on coming on like crazy, giving me the same code p0132 and p1136. I know the o2 sensor can lead me to get code p1136, so i thought maybe the o2 sensor that i put in the car was maybe defective, so i ordered a new bosh o2 sensors direct fit from Authoausaz the one before the catalytic and after the catalytic i installed it yesterday reset the codes and drive the car for a few and here we go again with the same code p0132 and p1136 keep resetting it and it keeps coming back, my car burn alot gas only give me 300 miles on a full tank. I know p0132 is the o2 sensor before the cat i replaced it reset it and still getting the same code.