I have codes showing 0135, 0136 & 0137. The indication is that the bank 1 o2 sensors are failing. I just had flywheel(whole other story) and clutch work done and am wondering if the mechanic banged or damaged the sensors. Also the local ford dealer quoted $85.00 to $105.00 for new sensors and was talking about sensor? exaust? calibration. Why can you buy bosch sensors for about half. Parts guy stated that bosch makes most of Fords o2 sensors. What is the difference? 75k on the sensors. Thanks Dan
