OBD-II & Electronic Engine Management Systems (96-on) Haynes TECHBOOK

Before buying this book, I bought "Automotive Diagnostic Systems: Understanding OBD I & OBD II," which is the other book that will probably show up if you are searching for books on this subject. In my opinion, this book (Haynes) is infinitely better. There is simply no comparison. In fact, I wish I hadn't wasted my money on the other book now that I have received the Haynes book. I have posted a review of the other book on Amazon. Now this book is more like it! While the other book was mostly theory and spent far too much time on the history of OBD, the regulatory aspects of it, etc., and was filled with meaningless charts and graphs and loaded with errors while not even showing a single picture of an actual sensor or an under-the-hood" picture, this book (Haynes) is what someone who works on cars really needs. It is loaded with pictures of the actual sensors, showing what they look like, where they should be located, how to diagnose them with tools besides just a code scanner (digital volt meters, vacuum gauges, vacuum tools, stethoscopes, etc.) This book is for people who don't want to just read a code but who want to get their hands dirty and fix the problem. The other book hardly mentions a word about fixing problems and it doesn't have a single picture of a sensor, where it should be located, etc. Instead, it just rambles on and on about theory to the point that one might get a headache. The Haynes book is a seat-of-your pants book that tells you exactly how to diagnose and fix problems. It's also much larger and covers a lot more information. In addition, it has an excellent glossary and index, unlike the other book. In short, the other book covers basically the history of OBD, theory, and so on while the Haynes book is far more practical. People who have worked on cars for many years like myself will get a kick out of how the Haynes book makes it clear that tools like vacuum gauges are still very useful while the other book casually mentions then in one sentence as if they are some kind of historical oddity. I was happy to see that I have almost every tool them mention in the Haynes book too. So don't throw away your vacuum gauge and other tools as the other book might suggest. I'm surprised at some of the negative reviews here for this book while the other book has better ratings, although far fewer reviews. Don't let that fool you. Get the other book if you want to have your eyes glaze over on meaningless 3D graphs that often have nothing to do with the accompanying text and seem to have been just thrown in to fill up space and you don't mind numerous errors in the text (my book is all marked up with corrections). On the other hand, if you want the background information AND hands-on instructions on how to actually diagnose and fix problems, this is the book for you. The differences in the book could be summarized by saying that the other book talks about OBD theory while this book shows you how to actually use a scan tool and fix problems you may encounter. Nothing is perfect, however. The only faults I find with the Haynes book is that it's printed on cheaper paper - about a grade above newspaper grade - and the pictures are in black & white. But it has infinitely more practical information. In fact, when I finished the other book, I had learned a couple things but I knew nothing more about actually fixing problems. If you don't want to just read about theory but instead want to see what the senors look like, where they are located, how to diagnose problems, what tools you will need to fix them, etc., this is definitely the book for you. I highly recommend this book. I just wish I had bought it before buying the other book.

The original reason I bought this book was to learn more about OB-II scanners to help me choose which one to buy. I learned that the OB-II (active) system does much more than ID system codes when your check engine light comes on. The better scanners can ID potential problem codes that have yet to trigger the check engine light, can give actual real time data of operation of sensors and much more. But the surprise was all the OTHER information in this book. It explains the operation of each individual sensor and how they work together, even their "normal" location with black and white pictures. The time and conditions of automatic "resetting" of sensors is explained (how many "trips" etc.). I have the actual factory service manuals for several cars which provide location, electrical data, how to remove sensors etc. but they do not provide a understanding of the how and why like this book. While service manuals may explain "how" to accomplish repair, they do not necessary explain "what" to repair -- and I believe this book will help very much to diagnose problems in conjunction with a good OB-II scanner. IE just because a scanner ID's a certain sensor does not necessary mean that sensor is bad -- It may mean it is doing its job and identifying a problem with that system -- and the book helps very much to explain how the systems work together. While a certified mechanic may (or may not) know most of this book, I think the average person will find this book to be very helpful to understand their own automobile and how to approach problems and repairs. If you find you already know all that's in this book -- you should open your own repair shop. Yes the book seems to be on poor quality paper, a note in the book points out it is printed on recycled paper. It is just as most of the Haynes manuals are. I would probably never bought this book going by the picture on the cover, except that I was interested in getting a scanner. But the real value is all the other information that the book provides which I did not have a clue would be within. I guess that is proof "You can't judge a book by it's cover".

I will not be working on my car, so this book may not be helpful. However I do not want the repair shop to think I I am "stupd" about my car. The price of the book is a small price considering the cost of car repairs. The book does go out of its way to explain every system that stores emission codes and the complexity of getting the problem fixed. It gives a brief explanation of each system componets. Breaking a pressurize gas line is certainly out of the question. Starting a fire or doing more harm then good is a possiblilty. If you are talented and want to work on your car it makes more sense to get a real expensive shop manual for your make and model car. They are very expensive. Or find a Automobile Repair Shop that is very very honest. I do have a code reader and book. Will they every be useful... Maybe

Amazing. There is so much helpful information on troubleshooting problems that a normal Haynes vehicle specific is lacking that I would argue that you would be better off buying this and a decent obd2 scanner (Xtool A30M here) and skip the vehicle specific manual unless you are ASE certified. I feel Haynes expects you already know how to use specialty tools and I think it is just too much information and not enough explanation. This book is wonderful. I just got it yesterday and it's awesome. You can just blindly open to any section and bam you have learned something new, if you are a shade tree mechanic like me, a novice to a professional just brushing up on things to stay more efficient than the next tech. I told my mom this morning I wish I had this book years ago. I had to get rid of some nice cars that I couldn't afford to keep taking to a mechanic. I use that regret to fix things myself now and always tell people that I only ask for tools for presents because you will never regret having something that you might not use often but just like insurance you are glad it's there when you need it. This book will save you so much money.

This book is worth ten times the 15 or so dollars I paid for it on Amazon. I am an old Degreed Electronic Technician with about 45 years experience fixing things electronic/electrical/mechanical/automotive. By no means am I a professional mechanic involved in repair of todays vehicles, but my broad base of knowledge and a ten year stint as a electronic/mechanical technical writer gives me a basis to judge the quality of this book from Haynes. .. It is just pure gold to say the least. If you have a diagnostic scan tool, you must have this book too. They go hand and glove in diagnosing and fixing your car. This book has lists of obscure trouble codes, explanations, hands on trouble shooting procedures of electrical automotive components using simple hand held test equipment written in easy to follow detail. Haynes makes interesting books for the prices they charge and this one is one of their best efforts. My hat is off to Robert Bosch Corp, and authors John Wegmann, Jay Storer and Mike Stubblefield. They did a great job of spreading hard to accumulate valuable information in a simple and easy to understand manner. Thanks Haynes for the wonderful book from a guy who has been searching for just such a work for many years. Regards, Darian P. Paganelli

Bought this for my pro mechanic son. Lots of good info. Most pros will know much of it but surely not all. Everyone can learn something from this book. Anyone who works on OBD1 and OBD2 vehicles should have this in their toolbox. You are bound to need it sooner or later, and when you do you'll be happy to have it. Covers many makes and models, includes all generic codes as well as many manufacturer specific codes. Clearly written. Easy to understand. A good reference book. Keep it in the bathroom until you learn it all.

Book seams to be informative just takes way too long to get, ordered code reader,and book as a bundle, got reader used it and got book two weeks later.

Loved this book.... very informative. The author presents a lot of information on history of OBDII, what and why. It goes into basic troubleshooting procedures and then a vast encyclopedia of which components trigger an OBDII MIL. A lot of information, presented in a clear concise manner. Working through this book will give you a solid background in how much detail the OBDII system can give to you. Note... this is for OBDII systems and not a general troubleshooting manual. If the code triggers, thats good. That's what this book is all about, Although it is not a general automobile system troubleshooting guide, the author takes time to present a lot of troubleshooting technique.

ヘインズの本は値段の割にどれも中身が濃く参考になるが、この本も多くの内容が盛り込まれている。星４つとしたのは、コード一覧が欲しくて買ったが、それ以外の内容をまだ読んでいないためであり、内容は星５つに値すると思う（たぶん）。

Parfait comme toute cette série de livres techniques.

After purchasing my OBD II scanner I have found the book very useful because my knowledge about car enginneering is very limited. The book explains in simple way, together with the pictures, your vehicle engine and I can say that some problems can be solved on your own.

la buena información , de que dispone, muy necesaria , a la hora de colocar un escáner en el vehículo y poder interpretar los códigos.

The mysterious electronics and black boxes under the bonnet simply explained and than are just plain sense. Great book to understand car emissions and electrics. Explains in simple terms what every black box, sensor, actuator, etc does and how it works. Explains how to test all of the above with both multimeter and fault code reader/scan tool. If you like to look after your own vehicles, get this book and a fault code reader and wave goodbye to main dealer and mechanics prices. Although I didn't have an engine warning light on the dash, the car was not running right and using more fuel. By looking at the live data on a hand held scanner I was able to trace the problem to the O2 sensor. Book took 10 days to arrive. Worth the wait.