1998 honda prelude check engine light goes on if i

If it runs good no worries. Your check engine light will turn on if theres a problem in one of your sensor, reving it on hi rpm will normally give you a light..

Hi there. There could be a number of problems here, the three focus points should be a faulty MAP (Manifold Absolute Pressure) sensor or there might be a problem with VTEC if that's fitted on your particular engine and the other is the Crank Angle Sensor. Firstly, you need to check out the PGM-FI ECU and see what LEDs flashing, this will certainly help narrow down the problem. As a visual check, make sure all the vacuum pipe connections are in-place and there are no broken, cracked or loose vacuum pipes, especially to the MAP sensor. Failing that, you might need the help of the Honda Dealer - but that's what I'd be looking at firstly. Best regards. Scottech

your o2 sensor is not reading right change it out and it will be fine