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Can anyone recommend a good engine diagnostic tool? I am thinking about the Autotap OBD II diagnostic scanner. It costs about $120-200 but also explains what the codes mean in plain english. thanks in advance. Jeff
The only thing I don't like about the innova is that apparently it only tells you the code and then you get to go figure out what it means.
Helms sells a book that lists all the codes, and what they mean. The shop manual does this too, though the codes are scattered in the various parts of the books associated with the particular systems to which the code relates.
I'd also note that the Innova is just a code reader. It can't read live parameters the way an actual diagnostic scanner can. The latter is a much more powerful diagnostic tool. Not only does it tell you what the ECM thinks is wrong, but it also lets you look at sensor readings to determine what is actually wrong.
Autotap lets you look at some live readings as well as at codes. A Tech II lets you look at all of the sensor data as well as letting you activate certain systems for testing. HP Tuners lets you view all parameters, and make changes to them (live for Gen III, and some Gen IV systems). So in order of capability you have code readers like the Innova, scan software like Autotap, interactive handheld scanners like the Tech II, and finally a full diagnostic and tuning tool like HP Tuners. Considering the capabilities it gives you, the $499 HP Tuner package is the best buy. It is nearly $2000 cheaper than a Tech II, but lets you do more.
After listening to everyone's comments, I just bought the Innova 3110 ($148 from Amazone.com) since it explains the codes. I'm kinda lazy and in a year from now don't want to have to try and remember where I put the book or where do need to go to figure out the codes. Since I have an LPE 403 engine, I just need to be able to read the codes to determine who to take the car to for warranty work; GM or an LPE certified mechanic.
Shopdog, I think your write up was right on the mark, its just that I don't want to start messing around with LPE's work for at least a few years. Thanks for your help.
...I'm kinda lazy and in a year from now don't want to have to try and remember where I put the book or where do need to go to figure out the codes.....
Just do a google search for OBD codes and you'll find this:
I have the Actron code reader that Autozone sells... Pretty nice, it comes with a book that tells the codes, but the display will also clearly list what it is while reading it.
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