Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 42 (ENGINE CONTROLS - TESTS W/CODES - EEC-V (4.6L))SERVICE CODE-TO-TEST REFERENCE MENUSDIAGNOSTIC TROUBLE CODE (DTC) REF CHART (CODES P0306-P1138)
1991 Mercury Tracer Base, 4D Sedan, Automatic
Diagnostic Trouble Code (DTC) Ref Chart (Codes P0306-P1138)
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Diagnostic Trouble Code (DTC) Ref Chart (Codes P0306-P1138)
WARNING: This page is about a different car, the 1994 Mercury Cougar and 1994 Ford Thunderbird. However, it is still accessible from the selected car via links, so may be relevant.
DTC REFERENCE
| 3-Digit Code | Description | Go To KOEO | Go To KOER | Go To CONT. | ||
|---|---|---|---|---|---|---|
| P0306 | Misfire Monitor | -- | HD1 | HD1 | ||
| P0307 | Misfire Monitor | -- | HD1 | HD1 | ||
| P0308 | Misfire Monitor | -- | HD1 | HD1 | ||
| P0320 | Ignition Diagnostic Monitor (IDM) | -- | -- | NA1 | ||
| P0340 | Cylinder Identification (CID) Circuit | -- | -- | DR1 | ||
| P0402 | EGR System | -- | HE20 | HE20 | ||
| P0420 | Catalyst Efficiency Monitor & Exhaust Systems | -- | -- | HF20 | ||
| P0430 | Catalyst Efficiency Monitor & Exhaust Systems | -- | -- | HF20 | ||
| P0443 | Evaporative Emission System | HV9 | HV9 | HV9 | ||
| P0500 | Vehicle Speed Sensor (VSS) | -- | -- | DP1 | ||
| P0505 | Idle Air Control (IAC) Valve | -- | KE2 | -- | ||
| P0703 | Brake On-Off (BOO) Switch | -- | FD1 | FD1 | ||
| P0705 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P0707 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P0708 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P0712 | Transmission Fault | TE 1 | TE 1 | TG 90 | ||
| P0713 | Transmission Fluid Temperature (TFT) Sensor | TE10 | TE10 | TE100 | ||
| P0720 | Output Shaft Speed (OSS) Sensor | -- | -- | TF1 | ||
| P0731 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P0732 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P0733 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P0734 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P0735 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P0741 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P0743 | Transmission Fault | TC 1 | -- | TG 90 | ||
| P0750 | Transmission Fault | TC 1 | -- | TG 90 | ||
| P0755 | Transmission Fault | TC 1 | -- | TG 90 | ||
| P0756 | Transmission Fault | TC 1 | -- | TG 90 | ||
| P1000 | Diagnostic Trouble Code P1000 | (1) | (1) | QC1 | ||
| P1100 | Mass Airflow (MAF) Sensor | -- | -- | DC2 | ||
| P1101 | Mass Airflow (MAF) Sensor | DC1 | DC1 | -- | ||
| P1112 | Temperature Sensor Test (IAT & ECT) | -- | -- | DA90 | ||
| P1116 | Temperature Sensor Test (IAT & ECT) | DA1 | DA1 | -- | ||
| P1117 | Temperature Sensor Test (IAT & ECT) | -- | -- | DA90 | ||
| P1120 | Throttle Position (TP) Sensor | DH2 | DH2 | DH2 | ||
| P1121 | Throttle Position (TP) Sensor | -- | -- | DH12 | ||
| P1124 | Throttle Position (TP) Sensor | DH1 | DH1 | -- | ||
| P1125 | Throttle Position (TP) Sensor | -- | -- | DH17 | ||
| P1130 | Fuel Control | -- | -- | H40 | ||
| P1131 | Fuel Control | -- | H40 | H40 | ||
| P1132 | Fuel Control | -- | H40 | H40 | ||
| P1137 | Fuel Control | -- | H80 | -- | ||
| P1138 | Fuel Control | -- | H80 | -- | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.