In the computer. If check engine light is on you can get them by plugging a reader into port under dash,.
read my answer to reseting engine codes below...2001 olds silhouette..
To tell you to read the diagnostic codes.
To read diagnostic codes on a 2005 Jaguar Vanden Plas, you will need an OBD-II scanner. Connect the scanner to the OBD-II port, usually located under the dashboard near the driver's seat. Turn on the vehicle's ignition without starting the engine, then follow the scanner's prompts to retrieve the diagnostic trouble codes (DTCs). These codes can then be cross-referenced with a diagnostic manual or online resources to identify issues.
To retrieve diagnostic trouble codes (DTCs) on a 1991 Park Avenue, you can use an OBD-I diagnostic tool or a paperclip to short the diagnostic connector. The connector is usually located near the driver's side, under the dash. By bridging the appropriate terminals (often A and B), the check engine light will flash, indicating the codes. Count the flashes to determine the specific trouble codes based on the service manual.
To retrieve engine codes from a 1992 Suzuki Sidekick, you need to locate the diagnostic connector, typically found near the driver's side under the dashboard. Use a jumper wire to connect terminals A and B on the diagnostic connector, then turn the ignition key to the "On" position without starting the engine. The check engine light will blink a series of codes that correspond to specific diagnostic trouble codes (DTCs). Count the blinks to identify the codes, which can then be cross-referenced with a service manual for interpretation.
To retrieve trouble codes for a 1989 Mazda MX-6, you can use the diagnostic connector located under the dashboard. First, turn the ignition key to the "ON" position without starting the engine. Then, use a jumper wire to connect terminals E1 and TE1 on the diagnostic connector. The check engine light will blink in a series of codes that correspond to specific trouble codes; count the blinks to interpret the codes according to the vehicle’s service manual.
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There are literally hundreds of diagnostic codes that would cause the check engine light to come on. Many auto parts stores will check the codes for free and tell you what is needed to fix it.
Engine chokes and loses power when accelerator is pressed
First you remove the cover from the diagnostic port under the driver's side of the dashboard. Then you plug the datalink cable from your scan tool into the diagnostic port. The scan tool will then show the diagnostic codes. Write them down and read a manual to see what has gone wrong.
Diagnostic codes are generated by your on-board computer. They tell you what problems the computer has identified with your engine. The codes are numbers. The code numbers are read by an instrument that plugs into a special jack under the dash. Auto parts stores often will check your diagnostic codes for free, or you can have your dealer do it.
The 38-pin diagnostic connector on a Mercedes-Benz SL500 is typically located in the engine compartment, near the driver's side. It can usually be found near the fuse box or on the left side of the engine bay. This connector is used for connecting diagnostic tools to read error codes and perform troubleshooting. Always refer to the vehicle's service manual for the exact location and additional details.