What do you do when the check engine light on 95 tracker is on and the diagnostic does not give you any codes at all and the engine light will not reset?
I have a 95 Tracker as well and recently it turned 100,000 miles. At 100,001 the "check engine light" came on. A local mechanic did a diagnostic and it also didn't give any codes to help reset the light or alert me of a problem. I asked him about the reset "switch" under the dash and he said he never heard of that. I investigated on my own when I got home, because the light being on was driving me crazy, and there actually is a small switch that reset the light. I removed the small plastic panel under the steering column and found it between the drivers side speaker and the steering column. It is really small. It is a black plastic switch with a metal face plate. You really have to look for it because it's settled in with the wire harness' under the dash. I flipped the switch and the light went out. Again be patient when looking for the switch. It's there you just have to look close to the dash and next to the steering column. I tried removing the battery cables because I read that that would reset the light but had no luck doing it no matter how long I left them off.
What would cause the check engine light to stay on on a 1996 Geo Tracker and the code to say EGR malfunction when the EGR valve is new?
After replacing the EGR valve, use the diagnostic tool and erase codes then read the codes again. I had the same problem on my 97 geo metro. After replacing the egr valve, the check engine light stayed on. After a while it was suppose to clear itself but it didn't. So I went to autozone borrowed their diagnostic tool, erased the codes and then my car passed and the check engine light went off.
It is the port, where a diagnostic machine can be hooked up. The diagnostic will read codes from your vehicles computer. For instance if your check engine light comes on, you can plug the diagnostic machine into the data port and it will tell you why the check engine light came on so that you can get it fixed.
Diagnostic codes are generated by your on-board computer. They tell you what problems the computer has identified with your engine. The codes are numbers. The code numbers are read by an instrument that plugs into a special jack under the dash. Auto parts stores often will check your diagnostic codes for free, or you can have your dealer do it.
When the Check Engine Light (CEL) comes on, it means something wrong was detected, either with emissions or performance. When this happens, the computer will have a diagnostic code in memory that can be retrieved with an OBDII scanner. Auto Zone will scan and retrieve the diagnostic codes free of charge.
The computer turns on the check engine light in hopes that you'll check the engine codes. It means something is wrong. Use an engine diagnostic scanner to find out what it is. It's easy to do and you can usually borrow one from your local auto parts retailer, they'll often help you figure out what it all means.