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What are the diagnostic codes for Service Engine Soon light stays lit on a 2001 Chevy Suburban?

The "Service Engine Soon" light (SES) on a 2001 Chevy Suburban, or any vehicle for that matter, doesn't have a single diagnostic code. The light illuminates because the onboard diagnostic system (OBDII) has detected a problem and stored a trouble code (or multiple codes).

To find the specific diagnostic trouble codes (DTCs), you need to use an OBDII scanner. These are relatively inexpensive and can be purchased at most auto parts stores. Many auto parts stores will also scan your vehicle for free.

The scanner will read the codes stored in the vehicle's computer. These codes are alphanumeric (e.g., P0171, P0420, C1234) and correspond to specific problems within the engine, transmission, or other systems. You'll then need to consult a repair manual or online database (like a Haynes manual or websites specializing in automotive diagnostics) to understand what each code means.

Without using a scanner, you cannot determine the reason the SES light is on. Any attempts to guess are unreliable and may lead to unnecessary repairs.

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