What does the PCM do in a jeep?
What does the PCM do in a jeep? The Powertrain Control Module (PCM) in your Jeep is designed to serve as the brain of your vehicle's engine. The PCM is what is often referred to as your Jeep's "computer." It controls a variety of functions, including how your engine runs and the individual sensors that provide it with information. What is part number for O2 sensor on Jeep Wrangler? **Another confusing part: If you own a non-Cali jeep, buy part number 13122 for upstream!! Part number 13280 O2 sensor is for Cali-emissions and won't fit your upstream. As for downstream,...