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The Ford Ranger has close to 2,000 different diagnostic trouble codes (DTC) that may show up when there's an issue with the engine. To identify the problem, you'll need to utilize an OBD II scan tool to retrieve the stored codes in the ECU triggered by the issue that led to the check engine light or DTC system activating in your truck. The most frequent cause of the check engine light illuminating is usually a vacuum leak, often stemming from a loose gas cap. Other issues could arise from fuel delivery problems or malfunctioning engine sensors. Upon receiving a DTC code, you can cross-reference it with a chart to pinpoint the specific problem with your truck.
You can locate Ford Ranger DTC (Diagnostic Trouble Codes) in the vehicle's manual. These codes help manufacturers identify and troubleshoot vehicle issues.