Assuming it is a 4 cylinder, look at the exhaust manifold, it comes from the engine. now follow it down you see a sensor with 4 wires coming out of it, that's it. you might want to remove the 12mm bolst to get better access to the 02 sensor. after you replace the sensor, you need to remove the EFI fuse from the engine compartment fuse block for a minute or so to reset the computer. If it is a 6 cylinder, it is the sensor towards the firewall. GOOD LUCK with this one.
in the exhaust manifold toward the firewall its the hard one!!!
16518- P0134 O2 Sensor Circ.,Bank1-Sensor1 No Activity Detected 16519- P0135 O2 Sensor Heater Circ.,Bank1-Sensor1 Malfunction
O2 Sensor Stuck Lean (Bank1 Sensor1).
It depends on which sensor, O2/camshaft,etc. The O2 sensor is a straight metal sensor that is screwed into the exhaust. There is an upstream/bank1-sensor1 or down stream/bank1-sensor2 after the catalytic converter. A camshaft sensor is an L shaped, usually black sensor that is installed into the head closest to the firewall(bank1).
You need get a special socket for oxygen sensors. Disconnect the harness, use the socket to remove the sensor. Reinstall a new one. Tighten the sensor the proper torque. Put some dielectric grease on the harness, reinstall the harness. Reset the ECU.
The diesel has two. Sensor one is closer to the engine.
On a 1995 Mercury Cougar ( V8 and V6 ) Bank 1 is the passenger side of the engine Sensor 1 would be close to the engine before the exhaust passes through the catalytic converter
Bank 1 is the passenger side of your V6 in a Ford Ranger Sensor 1 is somewhere close to the engine before the exhaust enters the catalytic converter
that is the oxygen sensor on the exhause manifold.
You can find it in the exhaust manifold, it's visible from the engine compartment. Basically it's between the engine radiator.
On a Ford F-250 4.6 V8 engine : Bank 1 is the passenger side of the engine Sensor 1 would be close to the engine BEFORE the exhaust enters the catalytic converter
Bank 1 is the driver's side head, Sensor 1 is the first sensor in the exhaust system as soon as it starts off of the exhaust manifold. Just follow the exhaust pipe on driver's side head to the first o2 sensor.