SOURCE: check engine light on 1997 Honda accord EX
Hi
If the engine is running without any problems then The fault code which has flagged the checked engine light will either pertain to the upstream O2 sensor, a drop in catalytic efficiency, an EGR issue, or maybe even an EVAP issue.
A lot of EVAP issues can be resolved by simply ensuring that the fuel filler cap is on securely, otherwise a vacuum leak will be detected in the system and the check engine light will come on.
A drop in catalytic efficiency (P0420) is usually temporary and will stay away after a reset.
EGR issues can sometimes be rectified by removing the EGR valve and cleaning it, and the ports on the intake where it was sat, but there are occasions when it has to be renewed.
The O2 sensor issues are a wee bit different. There are a number of fault codes which relate to the O2 sensor, and which make the O2 sensor look faulty, when the O2 sensor is actually attempting to rectify a problem from elsewhere and isn't faulty at all. However, they could also be due to a fault with the O2 sensor. Basically, further checks should be made before condemning the O2 sensor should the fault code relate to the sensor.
Have a code read done and then have the codes reset and see what comes up.
Regards
Geordie
SOURCE: honda civic dies when high rpm
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SOURCE: Check engine & maintenance required lights on
My maintenence required light comes on when it's time to change the oil.
SOURCE: gauges don't work on 2004 Honda Civic EX
it sounds to me that the instrument cluster has gone bad. not for certain because I cannot see it but if you have a mechanic tell you that it is a very strong possibility.
SOURCE: 01 honda civic ex is reving non stop, even the gas
check your throttle cable or most of the times its your o2 sensor remove it while the car is on and it should stop so replace them
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