"Check Engine Light"

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How can I test my EGR?

My check engine light has come on a couple of times, and each time the code was P0300 Random Misfire detected. According to this site, one cause could be a bad EGR. Another symptom of a bad EGR is ...
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votes
3answers
434 views

What are good features to look for in an ODB-II reader

I recently took my car in for the engine light. It turned out to be a minor problem (crack in gas cap let water in). It would be nice to have a low-cost ODB-II reader to be able to find out for ...
2
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1answer
1k views

Cause of P0440 on 1999 Subaru Legacy Outback

I get a P0440 code on my Outback on almost every highway trip over 5 miles. Is this caused by the leak in the gas tank or could it be something else?
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2005 Dodge Ram: easy way to diagnose code P0420?

My truck is reporting a code P0420, which apparently is "Catalyst System Efficiency Below Threshold (Bank 1)" which can either be the catalytic converter or the rear O2 sensor. The code came on at ...