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The only OBDII scanner I have any familiarity with is the Actron CP9145. I'm guessing they all either do what they're s'posed to or don't. This one will read codes (and give 1 line explanation), reset the check engine light, load and store data specific to your OBDII vehicle, and allow real-time monitoring of many engine parameters we don't normally get to see. I love it. I think I paid a bit much for it ($329 or so when I've seen 'em for well less than $200), but it's paid for itself many times over in trips saved to the mechanic.
Any particular reason you're looking at the two scanners you mentioned?
yes, I have a recurring P0402 (excessive EGR flow) problem. See my recent post in this forum. Thanks for your help. Any suggestions on my EGR flow problem?
click on the "windows version" button to see some of what it does. This unit only works with a (laptop) computer, but it's less than 100 bucks. I don't know if it's capable for everything you want it to do, but it might be worth a look.
Actron CP9135 here. It gives me the code with a one line description and the ability to erase the codes, reset the MIL, and monitor the OBDII Monitors. I got it from E-Bay for about $100.
As far as ideas for fixing your P0402 problem, type "P0402 EGR" or something to that effect into Google and check the results. I fixed a P0171 & P0174 "Lean Burn" situation on my Windstar last week with the scanner & Internet info.
I ordered the Auto Enginuity ST01 this afternoon. Since I already own a laptop, why purchase any more hardware that i don't need? The ST01 willo deliver more information than a hand held like the Actron, and will allow me to store data for comparison later. I like the ability to add-on and obtain upgrades with the ST01 also.
I received my AutoEnginuity tool yesterday and installed the software to my laptop while at work. I plugged it into one of our company vehicles to test it out. Installation and finding the connection and the vehicle was a snap. Probably a lot more info than I'll ever be able to use. While the truck I checked had no codes, it still provided a lot of info. I can't wait to try it out on the wife's Explorer this weekend. been fighting O2 sensor and misfiring codes for a year. If you're considering an OBDII tool, and already own a laptop, you can't go wrong spending the extra money.
The basic software and tool is for all makes with OBDII. They also sell manufacturer specific upgrades that give additional sensor and system info specific to those makes. Info at http://www.autoenginuity.com/index.html