Check engine light

Many auto parts stores will read the codes for free.

Most likely reasons:

O2 sensor(s) EGR value and/or charcoal canister gas cap problem

You can still run the car, but you will have to get it fixed prior to next emissions inspection (where applicable). Also, in some cases, especially if the engine is not quite as smooth as previously, it "could" be doing some damage to the engine if you drive it that way for a long time.

auto zone

From Autozone's free repair guide. 1996+ use Autozone's OBD-II reader, pre-1996 see:

Driveability & Emissions Controls --> Trouble Codes --> Reading codes

1982-95 MODELS All models except the 1MZ-FE engine is equipped with OBD I till 1995.

1. Make sure the battery voltage is at least 11 volts. 2. Make sure the throttle valve is fully closed. 3. Place the gear shift lever in Neutral. Turn all accessories off. 4. The engine should be at normal operating temperature. 5. Using a jumper wire, connect terminals TE1 and E1 of the Data Link Connector 1 (DLC1). 6. Turn the ignition switch ON, but do not start the engine. Read the diagnostic code by the counting the number of flashes of the malfunction indicator lamp. 7. Codes will flash in numerical order. If no faults are stored, the lamp flashes continuously every 1/2 second. This is sometimes called the Normal or System Clear signal. 8. After the diagnosis check, turn the ignition OFF and remove the jumper wire. 9. Compare the codes found to the applicable diagnostic code chart. If necessary, refer to the individual component tests in this section. If the component tests are OK, test the wire harness and connectors for shorts, opens and poor connections.

Thanks, this month everything is breaking.