Where is o2 sensor on ford f150

As a vital component to Your truck's emissions system the sensors monitor the amount of oxygen in the exhaust which in turn directs the air to fuel mixture allowed into the engine's combustion chamber by the PCM. David Bishop July 29, Bank 1 sensor one oxygen sensor for a fXLT with a 4. Dustin December 13, William S.

April 10, Kenny September 1, When a sensor failure is detected, a diagnostic trouble code DTC and check engine light are typically set identifying the faulty O2 sensor. There are 4 O2 sensors on a - Ford F; two before the first catalytic converters on each bank of the engine and two inside each of the rear catalytic converters on each bank of the engine see map below. The O2 sensors closest to the engine are referred to as "upstream" sensors, while the rearmost are referred to as "downstream" sensors.

There is a difference between upstream and downstream sensors, so mind the correct part number s for your vehicle. For each sensor, you'll need to 1 disconnect the electrical connector on the sensor pigtail, 2 remove the old sensor, 3 install the new connector using a liberal amount of anti-seize compound on the threads, and 4 reconnect the electrical connector.

It is not uncommon for the threads in a sensor bung to strip - details on repairing the threads can be found below. The hex head at the base of the sensor is extremely easy to round off with an open end wrench or crowfoot. To make matters worse, you can expect the sensors to be extremely tight in their bungs. You may need to access a range of tools in order to reach all the sensors - do not expect to reach them all with a simple wrench.

Some sensor locations have greater spacial constraints than others. It is accessed from beneath the truck. Loosening the exhaust clamp located behind the catalytic converter and unbolting the exhaust collector that connects the exhaust system to the exhaust manifold allowed us to lower a foot section of the exhaust system that contains the two catalytic converters.

This gave us just enough room to access the sensor, remove it with a 22 mm flare nut wrench, install the new sensor, and slide the exhaust back into place. This may not be required for all applications, but it made the task much easier in this case.