How-Tos

Replace a 4x4 Vacuum Actuated Hub (IWE)

The integrated wheel end (IWE) on Ford F-150 4x4 is known to make a clicking or ratcheting sound when it begins to fail. This is usually due to a vacuum leak in the actuator. Learn how to diagnose and replace it step by step, including torque specs.

How to Diagnose Ford F-150 Wheel Bearing Hub Assembly

Diagnosing a wheel bearing concern can be a daunting task. We have simplified the process to help you quickly and accurately identify a wheel bearing issue on your Ford F-150.

How to Diagnose a VVT Solenoid on a GM 2.4L

Step by step instructions of how to diagnose a variable valve timing (VVT) solenoid on a GM 2.4L engine.

How to test an EVAP charcoal canister

Learn how to test a charcoal canister for proper functionality.

EVAP Fuel Tank Pressure (FTP) Sensor Test (2025) — Step-by-Step DIY for Codes P0452–P0453

Learn how to test an EVAP fuel tank pressure (FTP) sensor: symptoms, common codes (P0452–P0453), expected voltages by make, and scan tool or multimeter steps.

EVAP Purge/Seal Leak Test

Learn how to perform a smoke test to identify leaks in your cars EVAP system.

How to test EVAP Purge Solenoid

A purge solenoid is a normally closed solenoid that controls the flow of engine vacuum to the EVAP system. It can through multiple DTCs including P0440, P0441, etc. Learn how to test a mechanical or electrical solenoid for proper functionality.

How to test EVAP Vent Solenoid

A Vent solenoid is a normally open solenoid that closes when energized and seals the system when the EVAP monitor is running a leak test. Learn how to test this functionality.

How to Fix a Ford P1450 EVAP Code

Step by step instructions oN how to diagnose and repair a Ford with a P1450 EVAP Code.

How to Fix a P0171 code on GM 1.4L Engines

The 1.4L turbo charged 4 cylinder GM engine has a known issue resulting in P0171. Learn how to fix here.

How to Fix P0521, P0522, P0523 Codes on GM V8

Learn what can cause a P0521, P0522 or P0523 trouble code to sest on a GM V8 engine and how to fix it

Fix Chevy Cruze/Aveo/Sonic P0597 & P0598 — Thermostat Heater Circuit (1.8L)

Diagnose and repair Chevy Cruze/Aveo/Sonic 1.8L codes P0597/P0598. Includes thermostat resistance spec (~13–15Ω), control circuit test-light method, replacement steps, tools, torque, and video.

Fix Tire Pressure Light

What the tire pressure (TPMS) light means, common causes, and step-by-step ways to fix and reset it—including drive cycles, button resets, and relearn procedures.

How to Diagnose a P0420 Code

Learn how to diagnose P0420/P0430 codes with leak checks, O₂ sensor graphs, and confirmation steps before replacing the catalytic converter.

How To Replace Driver Side Window Switch Mazda CX-7

Learn how to replace the driver side window switch in a Mazda CX-7 in under 30 min.

How to Test an Oxygen Sensor

Step-by-step guide to diagnose, test, and replace oxygen sensors related to P0420 catalyst efficiency codes.

How To Use Your Ohm Meter

Learn how to setup your Ohm meter for testing, the difference between manual adjust and auto ranging, and how to understand the readings.

Knock Sensor Replacement Procedure

Learn how to replace a knock sensor on a 2006-2011 1.6L Kia Rio or Hyundai Accent

P0420 Catalytic Converter Trouble Code

DTC P0420 sets when the catalytic convertor fails to efficiently remove harmful pollutants from the engines exhaust gas.

Parasitic Battery Draw Test

A dead battery causing your car to not start is never fun. You recharge the battery or replace it and the vehicle’s alternator is functioning properly, but the car doesn’t start again the next day. The battery is dead again! This is called a parasitic draw or an unintended battery drain.