I went to AutoZone & they stopped doing check engine light test unfortunately, they only sell the device to read the codes.
-Alex
Well, then, it's time to buy one. I have this.....
Amazon.com: Actron CP9180 AutoScanner Plus Diagnostic Code Scanner with Live, Record and Playback Data Capability and O2 Monitor Test for OBDII Vehicles: Automotive, but it's no longer available. That's ok, as it costs almost as much as a power window.
But lesser models are available , e.g. the 9125 for under $60. There are other suitable brands too.
Now why am I suggesting that you buy your own scanner? Pretty much for the same reason I suggested earlier that you buy a service manual for your car. To learn about it.
Scan tools are great. While they don't fix the car and only tell you what codes are in the computer <--- that's the point.
They tell you what's in the computer. On my last car purchase I told the sales man that I needed to read the codes in the computer before I would buy the car.
Now that doesn't always work, as codes can set anytime. And the dealer can clear the codes before you see the car, but I felt better doing it anyway.
The really good thing about scanners/readers is that they can 'clear' codes too. Why would you want to 'clear' a code? Well to see if the problem is really there or maybe it was just a fluke. (I would need a few paragraphs to explain the 'fluke').
There is a caveat here, that on some cars "Honda's" in particular (ask me I know) only a dealer should clear the codes. The generic scanner/reader is a bit of a brute force tool and it will clear ALL of the codes in the Honda computer. Even the ones that make the car driveable. Honda has layered it's memory and only a Honda reader/scanner can separate the layers. Grrr. a Honda scanner is about $8000.
But even at that, I can verify that there really is the code in there and that I'm not being railroaded. Not to say you are.
So now, a question for you. How did you come to realize there was a problem? (1) did a warning light come on, on the dash? (2) did you notice a problem driving, idling, etc? (3) was it the repair man?
If you plan to keep this car - (1) buy a service manual (2) buy a scanner (3) join a Volvo forum or two.