Oxygen Sensors: How to Diagnose and Replace By Larry Carley c2007 Today’s computerized engine control systems rely on inputs from a variety of sensors to regulate engine performance, emissions and other important functions. The sensors must provide accurate information otherwise driveability problems, increased fuel consumption and emission failures can result. One of the key sensors in this system is the oxygen (O2) sensor. It is often referred to as the “O2” sensor because O2 is the chemical formula for oxygen (oxygen atoms always travel in pairs, never alone). The first O2 sensor was introduced in 1976 on a Volvo 240....

We found these instructions online and posted them for the use of our customers. I had to replace passenger-side front Dana 44 axle hub (unit bearing) and the axle u-joints after 100,000 miles on my non-ABS 97 Dodge Ram 1500. To check for hub failure prior to the wheel falling off, you can jack up the wheel, grab the top and bottom and try to wiggle it. If it moves, then you need hubs or ball joints. Watch the ball joints for movement. If they stay put, then the hubs are bad. Although they can be pricey, I recommend replacing...

The Ignition distributor is basically the heart of the ignition/spark system. The PCM, ECM, or vehicle computer is the brain and controls the distributor. The distributor is being removed from most late-model vehicles and a direct ignition system is being installed. The direct ignition system basically supplies spark directly to the spark plug rather than going through a distributor to distribute the spark. The distributor has many parts including moving mechanical parts and several electrical components that are subject to extreme engine conditions such as heat and extreme voltage that the ignition coil produces. Most late-model vehicles that still use...

This information is from the Ford Service Manual and is specifically for a 2002 Ford Explorer. However, it can be used for all 2002-2010 Ford Explorer’s, Mercury Mountaineer’s, and Mercury Mariner vehicles. The hub bearing on the rear of these vehicles is unfortunately not a bolt-on hub assembly. This is a job that a do-it-yourselfer can do. However, this repair requires the actual bearing and outer hub to be pressed in/out. The best way to go about this repair is to have a machine shop do the actual press work. You can do all of the other labor yourself and save several hundred dollars...

Here is another set of instructions we found online. We copied and pasted them here for you and we added a few little tidbits. Thanks for visiting our site and we hope these will help you. You can also call our ASE certified staff with any questions at 1-866-770-2771. We provide these instructions free of charge and these are meant as a guide only. How To: Replace Front Wheel Hub Bearing Assembly on 2500HD/3500SRW (dually similar): Preface: The front wheel hub bearing assemblies on the Chevy and GMC 2500 and 3500 series trucks are very expensive to replace. The good news...