Actron CP9135 AutoScanner Diagnostic Code Scanner with On Screen Definitions for OBDII (Post-1996) Vehicles

I had a check engine light on. the dealer wanted 150$ to hook up the diag. Bought this diag. Turns out all I needed was a new gas cap. It paid for itself the in about 2 mins. A must for your tool box these days.

I had thought about buying the least expensive OBD II on Amazon. I bought it for my daughter's 1995 Volvo 850 GLT. It has an onboard computer system that will show you the codes. It is very difficult to turn the Check Engine Light off. I replaced the heated O2 sensor and just wanted to turn the Check Engine Light off. A reviewer had said how easy this model was to use and read. I am glad I sent the extra money. It was "easy" to read and to use. Thanks for putting those reviews on Amazon.
Yours truly,A Happy Customer

I have two cars and between the two of them I will have at least one check engine light yearly. The codes were simple to read and understand, and even easier to clear the codes. Being a novice mechanic, the diagnostic codes in this device will serve me well. What it doesn't have will probably mean I should take it to the mechanic anyway.

It's a good tool to have in a tool kit, plus is relatively inexpensive.


I could not get the CD to work however. But it appears to be not completely necessary.

I purchased this to use in attempting to diagnose check engine light problems I have and it did well as a code reader and eraser however if true diagnostics are needed and live information I recommend upgrading to the one that has all of that available.

I will be upgrading soon, however no regrets with this one, it did all I needed, gave the code and general cause. erases codes easy too which in some cases might solve the problem or at least allow you to rescan it immediately after the first time the light comes on again so you can home in on the original cause of the problem at hand as other codes will set behind it after a short time, a sort of chain reaction of the first and its affect on the engine fuel and ignitions system.

I purchased this Acton scanner 2 years ago when our older vehicle was repeatedly showing its MIL (Malfunction Indicator Lamp). I was able to clear the code immediately. When the MIL illuminated again later, I was able to track down the problem (O2 sensor heater trouble)and correct it by reseating the connector. Later, I used the scanner to diagnose which cylinder was misfiring. By tapping on that cylinder's fuel injector, I was able to correct the misfiring. Again, the Acton cleared the MIL display.
My mechanic uses a more sophisticated (and much more expensive) OBD scanner in his day to day work, but for someone who does occasional maintenance on his own car, this tool is worth the $89 investment. If you paid more, you paid too much.