ScanGuage D - We should buy it?

BobnSofi wrote:

We have a 2005 Diesel RV. A check engine light has come on and off.

Seems you need a ScanGuage D for this job of CEL analysis.

It's been doing this for more than 3 years on my daily commuter car (gas). A bit older than yours, not much computerized analysis can be done (if any). Like people said, results may or may not be useful. 2 possible suspects were identified in my car, both were replaced, the light was quiet for a year and then re-appeared again, few days on, few weeks off. Some issues cannot be fixed or the cost is unrealistic.

Buy it if you have faith (and disposable income). Your local shop will probably do any possible analysis for $60 and recommend some repairs, but the question is whether you can trust them. Some things they just can't do because it can't be done.