Parts & Diagnostics Guides

How to tell whether a power window fault is the master window switch, the individual door switch, the motor or the wiring, and how to order the correct replacement panel.

Where the OEM part number is located on engine computers, transmission modules, climate control panels and master window switches, and why it beats year, make and model.

How to identify the correct ECM or PCM for a Ford E-150, E-250, E-350, Econoline, Windstar or Transit, including where to find the part number and which engine sizes matter.

ECM, ECU, PCM, PCU, TCM, TCU and BCM explained in plain English, plus how to tell which module your vehicle actually uses before you order a replacement.