kdx2000
New member
I have a 99' Limited with a 3.4 v-6. About a week ago I replaced the forward oxygen sensor and the coolant temp. sensor. I cleared the codes once the work was complete and the CEL managed to stay off.....until today. I had just gotten about 1 mile from my house and the CEL came on again. I have also noticed that the engine seems to be surging at lower speeds. After the light came on, I ran the scanner again and it gave me the P1133 code, Air-Fuel Sensor Circuit Response Malfunction. I have a Haynes manual, but I can't seem to find out where the sensor is. By the way this 4-runner has about 137K miles on it. On my way home today I stopped by a local mall for a few things and when I went to leave, I was accelerating and the engine was acting like it was going to stall. I made it home ok. Does anyone have any ideas or suggestions?
Thanks!
Thanks!