Check engine light

Replace the valve cover seal

The check engine light is commonly activated by a loose gas cap, regardless of vehicle make or model. Having said that, it could also be a more significant issue. You may want to err on the side of caution and schedule a maintenance.

If it's come on recently (especially if you noticed it shortly after refueling) and you don't notice any difference in the way the vehicle has been starting, handling, or otherwise operating, you can try to unscrew the gas cap, screw it back on based on the vehicle user manual or instructions printed directly on the cap (i.e. turn until three clicks, turn until hand tight), and drive the vehicle around for a few days. The light usually won't deactivate immediately after correcting the problem. You'll have to drive it around for a couple of days to a week in order for the check engine light to go away.

Fuses, check all of them. Check relays, sometimes tapping with the handle of a screwdriver will get a faulty one to work intermittenly. Check dimmer switch and light switch. IF you have driven through water with leaking headlight benzels/covers, then water may have blown both. Im leaning towards fuses/relays or light switch.

see this steps and fix it. God bless you
The Check Engine Light (which is actually the Malfunction Indicator Lamp or MIL) alerts you when an emissions-related problem occurs with the engine control system or emission controls on your vehicle. Depending on the nature of the problem, the Check Engine Light may come on and remain on continuously or flash. Some intermittent problems will make the Check Engine Light come on only while the fault is occurring (such as engine misfire). The Check Engine light usually remains on once a fault has been detected, and will remain on to remind you that a problem has occurred that needs to be investigated.
An illuminated Check Engine Light can be annoying because you don't know what's wrong, and whether or not the problem might be a serious one or just a minor fault. There is no way to know what the problem is until you plug a scan tool into the vehicle's diagnostic connector and read out the code(s) that turned the light on.
If no other warning lights are on, and the engine seems to be running normally (no unusual noises, smells, vibrations, etc.), you can assume the fault that is causing the Check Engine Light to come on is probably minor and won't hinder your ability to continue driving. But if other warning lights are on, you should probably stop and investigate the problem.
When the Check Engine Light comes on, a diagnostic trouble code (DTC) is recorded in the powertrain control module (PCM) memory that corresponds to the fault. Some problems can generate more than one trouble code, and some vehicles may have multiple problems that set multiple trouble codes.

I have no dash lights so at night I can only use the speed set to let me know what speed im doing how do I fix them in 95 vs commodore

well a check engine light can come on for a bad o2 sensor the abs light coming on at higher speeds i would look at the front axle joint for the pick up rings i see them rust and split that split throws off the speed reading and the abs computer see different wheel speeds due to the crack you can get a remain axle to repair it

Check engine light on ? Any code's ?

o-2 sensor

95 toyota may have an early obd2 diagnostics,which started for all cars in 96,which means it can track a cylinder misfire,when ck light flashes it can mean multiple misfire detected causing serious loss of power,you can try going to autozone they do free ck engine light code reading ,tell them you may have obd2 plug according to web,let me know codes if you get lucky.with AZ its hit or miss

Bad ecm (engine control module) or prom chip issue. Prom is located inside ecm QDM is quad driver module which is electronic portion of ecm. Would replace ecm first remebering that prom chip must be swapped from old box to new.