Hi. While driving my 1997 Subaru Outback wagon (112K miles) recently the "check engine" light came on, illuminated in yellow letters. It stayed on until I refueled the car when it went off. I thought it must have been the gas cap not being on tight. But the light came back on again today. Gas cap looks secure. Before I take it somewhere to be checked out, any ideas as to what could be causing it? The car has had all of it's scheduled services since new. Thanks.
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the check engine light comes on if there is a problem with thecomputer system related to the emmision, when this is is repaired the light on can only be turned off with a monitor,code reader. some of these are quite inexpensive.over the web or at a part store.
I do not know for sure if this is the problem you are having, But, I have noticed that from 95 up to 2002 I have seen a lot of PO420 codes that have been just the sensor. I do not know if it was a weak sensor or just that program telling it that it is below threshold. I did notice that if the vehicles are run for a long trip at highway speed it goes out. I wish you luck and have a great day.
try disconnecting the + positive terminal for a few minutes and see if it goes out most likely the 02 sensor needs replacing ...however low fluid levels may also contribute to this oil,brake fluid etc.
I hate to tell you this but the guy isn't returning your calls because the head gasket is blown and he probably knew it. As for the 1990... have you checked the water pump for leaks? (front/ driver's side on the bottom of the engine) My guess is that it's faulty and unfortunately, it's behind the timing belt. Both of these repairs will be a pretty penny. Good luck!