Mustang Computer Code Identification by Year (1987-Present)

It’s very important to correctly identify your Mustang’s computer code, especially when you want to obtain some custom tunes. There are hundreds of codes out there and it would be near impossible and extremely hazardous to your motor if you attempt to guess your code. Below, you will find some examples of Mustang computer codes, arranged separately by year range and tips to help you recognize your specific ECU code.

More often than not, Mustang owners will tap into the ​onboard diagnostics, or OBD, to troubleshoot and tune the vehicle. For anyone running a 1996-current Mustang, they can confidently say the vehicle is equipped with an OBDII and move forward with whatever it is they have in mind. Owners of 1995 Mustangs can have either an OBDI or OBDII, which adds some confusion to the matter. Well not to worry, there is a really easy way to tell what you’ve got. All you need is the engine size. V8s of this model year were equipped with OBDI systems while the V6 models were given the OBDII early. Additionally, Cobras will have an OBDII port under the dash but it isn’t connected to anything as the car is equipped with an OBDI system. As far as scanners and modifications go, anything meant to work with OBDII will not work with OBDI.  Some builders find ways to modify components to work, though they do take a risk by doing so.

Depending on what year Mustang you have, your Mustang's computer code can be found in one of a few different locations. Below we've laid out where your computer code should live based on what Mustang you own. Keep in mind, the actual location may vary a bit, but generally they can be found very close to the area pictured. 

The Mustang computer code on 1987 to 2004 Mustangs should be on the passenger side (RH) door jam on a rectangular white sticker. However, sometimes the sticker can come off. In that case, you will need to look under the passenger side kick panel on the actual computer to get your Mustang's computer code. To remove the panel, simply run your fingers along the carpet to feel where it is separated and give a firm, but gentle tug on the panel to remove it; it should pop right off. Above are two example images from our 1998 GT Mustang: one showing the RH kick panel removed with computer/wiring exposed, second showing a close up of the computer code = DBZ2

The Mustang computer code for your 2005-2009 Mustang can be found under the hood, on the passenger side (RH) located on a silver rectangular box. Above are two example images from our 2006 GT Mustang: one overview of RH engine bay, second showing a close up of the computer code = TJF1. 

Please Note: the code can be located anywhere on the silver box, not just on the top as shown in the example.

The Computer Code on the 2010-Present Mustangs will be under the hood on the Passenger Side, located next to the Fuse Box on a silver metal bracket. Below are two example images from our 2014 GT Mustang: one overview of RH engine bay, second showing a close up of the computer code = DHW1.

Knowing your Mustang's computer code is crucial when it comes time to get a new tune. Whenever you want to have custom tunes created, your specific computer code will provide tuning specialists with the mapping of your ECU, showing them tables and graphs that are not the same with every computer code. Seeing this information allows them to dial in on the exact modifications you may have added to your Mustang and get your car running its best and at its maximum performance.

The 2015+ Mustangs are best tuned when we read the ECU Strategy and SWPN directly from the car. This does require you reading this information when you receive the tuner. Please submit your request when you are able to read this information for us.

Here is the computer location in the engine bay for maintenance or service. This is not needed for tuning purposes.

Below is a list of check engine codes or any problem codes that any year car may throw. It's not all of them but most of them. Best way to find your code is to hit Ctrl F, type in your code, and it should take you directly to it!

• P1000 – OBD-II Monitor Testing Incomplete
• P1001 – KOER Test Cannot Be Completed
• P1039 – Vehicle Speed Signal Missing or Improper
• P1051 – Brake Switch Signal Missing or Improper
• P1100 – Mass Air Flow Sensor Intermittent
• P1101 – Mass Air Flow Sensor out of Self-Test Range
• P1112 – Intake Air Temperature Sensor Intermittent
• P1116 – Engine Coolant Temperature Sensor is out of Self-Test Range
• P1117 – Engine Coolant Temperature Sensor Intermittent
• P1120 – Throttle Position Sensor out of range
• P1121 – Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
• P1124 – Throttle Position Sensor out of Self-Test Range
• P1125 – Throttle Position Sensor Intermittent
• P1127 – Heated Oxygen Sensor Heater not on During KOER Test
• P1128 – Heated Oxygen Sensor Signals reversed
• P1129 – Heated Oxygen Sensor Signals reversed
• P1130 – Lack of Upstream Heated Oxygen Sensor Switch – Adaptive Fuel Limit – Bank No. 1
• P1131 – Lack of Upstream Heated Oxygen Sensor Switch – Sensor Indicates Lean – Bank No. 1
• P1132 – Lack of Upstream Heated Oxygen Sensor Switch – Sensor Indicates Rich – Bank No. 1
• P1135 – Ignition Switch Signal Missing or Improper
• P1137 – Lack of Downstream Heated Oxygen Sensor Switch – Sensor Indicates Lean – Bank No. 1
• P1138 – Lack of Downstream Heated Oxygen Sensor Switch – Sensor Indicates Rich – Bank No. 1
• P1150 – Lack of Upstream Heated Oxygen Sensor Switch – Adaptive Fuel Limit – Bank No. 2
• P1151 – Lack of Upstream Heated Oxygen Sensor Switch – Sensor Indicates Lean – Bank No. 2
• P1152 – Lack of Upstream Heated Oxygen Sensor Switch – Sensor Indicates Rich – Bank No. 2
• P1157 – Lack of Downstream Heated Oxygen Sensor Switch – Sensor Indicates Lean – Bank No. 2
• P1158 – Lack of Downstream Heated Oxygen Sensor Switch – Sensor Indicates Rich – Bank No. 2
• P1220 – Series Throttle Control fault
• P1224 – Throttle Position Sensor B out of Self-Test Range
• P1230 – Open Power to Fuel Pump circuit
• P1231 – High Speed Fuel Pump Relay activated
• P1232 – Low Speed Fuel Pump Primary circuit failure
• P1233 – Fuel Pump Driver Module off-line
• P1234 – Fuel Pump Driver Module off-line
• P1235 – Fuel Pump Control out of range
• P1236 – Fuel Pump Control out of range
• P1237 – Fuel Pump Secondary circuit fault
• P1238 – Fuel Pump Secondary circuit fault
• P1250 – Lack of Power to FPRC Solenoid
• P1260 – Theft Detected – Engine Disabled
• P1270 – Engine RPM or Vehicle Speed Limiter Reached
• P1288 – Cylinder Head Temperature Sensor out of Self-Test Range
• P1289 – Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range
• P1290 – Cylinder Head Temperature Sensor Signal Less Than Self-Test Range
• P1299 – Cylinder Head Temperature Sensor Detected Engine Overheating Condition
• P1309 – Misfire Detection Monitor not enabled
• P1351 – Ignition Diagnostic Monitor circuit Input fault
• P1352 – Ignition Coil A – Primary circuit fault
• P1353 – Ignition Coil B – Primary circuit fault
• P1354 – Ignition Coil C – Primary circuit fault
• P1355 – Ignition Coil D – Primary circuit fault
• P1356 – Loss of Ignition Diagnostic Module Input to PCM
• P1358 – Ignition Diagnostic Monitor Signal out of Self-Test Range
• P1359 – Spark Output circuit fault
• P1364 – Ignition Coil Primary circuit fault
• P1380 – VCT Solenoid Valve circuit Short or Open
• P1381 – Cam Timing Advance is excessive
• P1383 – Cam Timing Advance is excessive
• P1390 – Octane Adjust out of Self-Test Range
• P1400 – Differential Pressure Feedback Electronic Sensor circuit Low Voltage
• P1401 – Differential Pressure Feedback Electronic Sensor circuit High Voltage
• P1403 – Differential Pressure Feedback Electronic Sensor Hoses Reversed
• P1405 – Differential Pressure Feedback Electronic Sensor circuit Upstream Hose
• P1406 – Differential Pressure Feedback Electronic Sensor circuit Downstream Hose
• P1407 – EGR No Flow Detected
• P1408 – EGR Flow out of Self-Test Range
• P1409 – EGR Vacuum Regulator circuit malfunction
• P1410 – EGR Barometric Pressure Sensor VREF Voltage
• P1411 – Secondary Air is not being diverted
• P1413 – Secondary Air Injection System Monitor circuit Low Voltage
• P1414 – Secondary Air Injection System Monitor circuit High Voltage
• P1442 – Secondary Air Injection System Monitor circuit High Voltage
• P1443 – Evaporative Emission Control System – Vacuum System – Purge Control Solenoid or Purge Control Valve fault
• P1444 – Purge Flow Sensor circuit Input Low
• P1445 – Purge Flow Sensor circuit Input High
• P1450 – Inability of Evaporative Emission Control System to Bleed Fuel Tank
• P1451 – EVAP Control System Canister Vent Solenoid Circuit Malfunction
• P1452 – Inability of Evaporative Emission Control System to Bleed Fuel Tank
• P1455 – Substantial Leak or Blockage in Evaporative Emission Control System
• P1460 – Wide Open Throttle Air Conditioning Cutoff circuit malfunction
• P1461 – Air Conditioning Pressure Sensor circuit Low Input
• P1462 – Air Conditioning Pressure Sensor circuit high Input
• P1463 – Air Conditioning Pressure Sensor Insufficient Pressure change
• P1464 – ACCS to PCM High During Self-Test
• P1469 – Low Air Conditioning Cycling Period
• P1473 – Fan Secondary High with Fans Off
• P1474 – Low Fan Control Primary circuit
• P1479 – High Fan Control Primary circuit
• P1480 – Fan Secondary Low with Low Fans On
• P1481 – Fan Secondary Low with High Fans On
• P1483 – Power to Cooling Fan Exceeded Normal Draw
• P1484 – Variable Load Control Module Pin 1 Open
• P1500 – Vehicle Speed Sensor Intermittent
• P1501 – Programmable Speedometer & Odometer Module/Vehicle Speed Sensor Intermittent circuit-failure
• P1502 – Invalid or Missing Vehicle Speed Message or Brake Data
• P1504 – Intake Air Control circuit malfunction
• P1505 – Idle Air Control System at Adaptive Clip
• P1506 – Idle Air Control Over Speed Error
• P1507 – Idle Air Control Under Speed Error
• P1512 – Intake Manifold Runner Control Stuck Closed
• P1513 – Intake Manifold Runner Control Stuck Closed
• P1516 – Intake Manifold Runner Control Input Error
• P1517 – Intake Manifold Runner Control Input Error
• P1518 – Intake Manifold Runner Control fault – Stuck Open
• P1519 – Intake Manifold Runner Control Stuck Open
• P1520 – Intake Manifold Runner Control circuit fault
• P1519 – Intake Manifold Runner Control fault – Stuck Closed
• P1520 – Intake Manifold Runner Control fault
• P1530 – Open or Short to A/C Compressor Clutch circuit
• P1537 – Intake Manifold Runner Control Stuck Open
• P1538 – Intake Manifold Runner Control Stuck Open
• P1539 – Power to A/C Compressor Clutch circuit Exceeded Normal Current Draw
• P1549 – Intake Manifold Temperature Valve Vacuum Actuator Connection
• P1550 – Power Steering Pressure Sensor out of Self-Test Range
• P1605 – PCM Keep Alive Memory Test Error
• P1625 – Voltage to Vehicle Load Control Module Fan circuit not detected
• P1626 – Voltage to Vehicle Load Control Module circuit not detected
• P1650 – Power Steering Pressure Switch out of Self-Test Range
• P1651 – Power Steering Pressure Switch Input fault
• P1700 – Transmission system problems
• P1701 – Reverse Engagement Error
• P1702 – Transmission system problems
• P1703 – Brake On/Off Switch out of Self-Test Range
• P1704 – Transmission system problems
• P1705 – Manual Lever Position Sensor out of Self-Test Range
• P1709 – Park or Neutral Position Switch out of Self-Test Range
• P1710 – Transmission system problems
• P1711 – Transmission Fluid Temperature Sensor out of Self-Test Range
• P1713 – P172 – Transmission system problems
• P1729 – 4×4 Low Switch Error
• P1740 – Transmission system problems
• P1741 – Torque Converter Clutch Control Error
• P1742 – Torque Converter Clutch Solenoid Faulty
• P1743 – Torque Converter Clutch Solenoid Faulty
• P1744 – Torque Converter Clutch System Stuck in Off Position
• P1745 – Transmission system problems
• P1746 – Electronic Pressure Control Solenoid – Open circuit
• P1747 – Electronic Pressure Control Solenoid – Short circuit
• P1749 – Electronic Pressure Control Solenoid Failed Low
• P1751 – Shift Solenoid No. 1 Performance
• P1754 – Coast Clutch Solenoid circuit malfunction
• P1756 – Shift Solenoid No. 2 Performance
• P1760 – Transmission system problems
• P1761 – Shift Solenoid No. 3 Performance
• P1762 – Transmission system problems
• P1767 – Transmission system problems
• P1780 – Transmission Control Switch circuit is out of Self-Test Range
• P1781 – 4×4 Low Switch is out of Self-Test Range
• P1783 – Transmission Over-Temperature Condition
• P1784 – Transmission system problems
• P1785 – Transmission system problems
• P1786 – Transmission system problems
• P1787 – Transmission system problems
• P1788 – Transmission system problems
• P1789 – Transmission system problems
• P1900 – Transmission system problems