The P1119 code is a manufacturer-specific powertrain diagnostic trouble code. Its exact definition depends entirely on the vehicle application, relating to intake air temperature, engine coolant temperature, or oxygen sensor heater circuits.
Because this code is manufacturer-specific, you must verify the exact factory definition for your vehicle. The code indicates a detected fault condition, but it does not automatically prove that any specific component has failed.
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Key Takeaways
- P1119 is a manufacturer-specific code, meaning its exact definition varies significantly by vehicle make and model.
- On Ford applications, it indicates a Manifold Absolute Temperature (MAT) or Intake Air Temperature (IAT) circuit high input.
- On GM applications, it refers to an Engine Coolant Temperature (ECT) signal out of range condition.
- On some Volkswagen and Audi applications, it signals an oxygen sensor heater circuit fault for Bank 2 Sensor 1.
- Proper diagnosis requires confirming the exact factory definition before testing any components or circuits.
P1119 Code Description and Implications
P1119 is a manufacturer-specific powertrain code, meaning its exact definition depends entirely on the vehicle application. There is no single universal definition for this error code across all automotive brands.
Ford applications: The code indicates a Manifold Absolute Temperature (MAT) or Intake Air Temperature (IAT) sensor circuit high input. The module detects the sensor is reporting an abnormally low temperature, typically due to an open circuit or short to voltage.
GM applications: The code refers to an Engine Coolant Temperature (ECT) signal out of range condition. The powertrain control module detects an illogical correlation between the ECT sensor and other temperature sensors, such as the transmission fluid temperature sensor.
Volkswagen and Audi applications: The code indicates an oxygen sensor heater circuit fault for Bank 2 Sensor 1, typically a short to ground that prevents the sensor from reaching operating temperature.
Common Causes of the P1119 Code
The causes of a P1119 code depend entirely on which system your vehicle’s manufacturer assigned this identifier to. Diagnostic testing is required to identify the root cause.
For MAT/IAT applications (such as Ford): Possible causes include a failing intake air temperature sensor, an open or shorted sensor signal circuit, damaged wiring harnesses, or poor electrical connections at the sensor connector.
For ECT applications (such as GM): Potential causes involve a faulty engine coolant temperature sensor, low coolant levels, a failing thermostat, or damaged wiring causing erratic signal correlation.
For oxygen sensor heater applications (such as VW or Audi): Causes may include a failed internal heater element in the Bank 2 Sensor 1 oxygen sensor, a blown heater circuit fuse, or wiring damage causing a short to ground.
Symptoms Associated With P1119
Because P1119 applies to different systems across various manufacturers, the symptoms you experience will depend on the exact application. MIL behavior also varies; some vehicles may illuminate the Check Engine Light immediately, while others may require repeated monitor failures.
MAT/IAT applications: You may notice hard cold starts, rough idling during warm-up, or incorrect fuel delivery as the engine computer miscalculates air density.
ECT applications: Symptoms typically include poor fuel economy, incorrect cooling fan operation, or the engine entering a fail-safe mode if the computer cannot verify the engine’s true operating temperature.
Oxygen sensor heater applications: You might experience no noticeable drivability symptoms other than the Check Engine Light, though the vehicle may fail an emissions test due to the sensor remaining inactive during cold starts.
Diagnosing the P1119 Trouble Code
Diagnosis must begin by confirming the exact factory definition of P1119 for your specific make, model, year, and engine. Using the wrong diagnostic path will lead to incorrect testing.
For MAT/IAT implementations: A scan tool capable of displaying live data is necessary. Monitor the intake air temperature reading and compare it to the ambient air temperature and engine coolant temperature after a cold soak. Inspect the sensor wiring for opens or shorts.
For ECT implementations: Verify the coolant level and inspect the ECT sensor connector for corrosion. Monitor the ECT sensor live data and compare it to the transmission fluid temperature and intake air temperature readings to identify correlation faults.
For O2 heater implementations: Inspect the oxygen sensor heater fuse. Measure the resistance of the heater circuit at the Bank 2 Sensor 1 connector and verify power and ground signals according to the manufacturer service information.
Repairing the P1119 Issue
Repairs must follow confirmed diagnosis. Never replace components based solely on the presence of the code.
If testing confirms a failing MAT or IAT sensor on a Ford application, replace the sensor with a component meeting the correct vehicle specification and repair any damaged wiring.
If diagnosis confirms an ECT correlation fault on a GM application, address the confirmed failed component, such as replacing a faulty coolant temperature sensor or thermostat, and ensure the cooling system is properly bled.
If the fault is isolated to the oxygen sensor heater circuit on a Volkswagen or Audi application, replace the Bank 2 Sensor 1 oxygen sensor and clear the codes.
Cost Considerations for P1119 Repairs
The cost to resolve a P1119 code varies because the underlying system differs by manufacturer. Exact pricing depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.
For an intake air temperature or coolant temperature sensor replacement, parts and labor costs are generally moderate. If the root cause is an oxygen sensor replacement, the cost will be slightly higher due to parts pricing. Always verify the exact cause before authorizing repairs.
Prevention Strategies for Future Occurrences
Preventing a P1119 code depends on the specific failure mechanism verified during diagnosis.
For temperature sensor applications, maintaining the correct coolant mixture and replacing the coolant at manufacturer-recommended intervals can help prevent internal corrosion that damages sensor elements.
For oxygen sensor applications, avoiding prolonged exposure to exhaust soot and ensuring the engine does not burn excessive oil can help preserve the sensor’s internal heater and sensing elements.
Troubleshooting Tips and Best Practices
Always verify the exact manufacturer definition before ordering parts. A P1119 code on a Ford requires entirely different diagnostic steps than the same code on a GM or Volkswagen vehicle.
Do not assume a sensor has failed simply because it is named in the code description on a generic database. Wiring faults, poor grounds, and connector corrosion are known culprits in manufacturer-specific circuit codes.
If your vehicle is equipped with relevant technical service bulletins or software updates, check for their applicability to your exact model. Some temperature correlation logic issues are addressed through manufacturer software recalibrations rather than hardware replacement.
Clearing the code without performing repairs does not fix the root cause and may remove valuable freeze-frame data needed for accurate diagnosis.
More OBD-II Codes
| P1118 | P1121 | P1122 | P1123 |
| P1124 | P1125 | P1126 | P1127 |
| P1128 | P1129 | P1130 | P1132 |
| P1133 | P1134 | P1135 | P1136 |
| P0117 | P0118 | P0125 | P0128 |
| P0111 | P0112 | P0113 | P0114 |
Frequently Asked Questions
Is the P1119 code a generic OBD-II code?
No. P1119 is a manufacturer-specific code. Its exact definition and the monitored system depend entirely on your vehicle’s make, model, and engine configuration.
Will a P1119 code cause my vehicle to fail an emissions test?
If your vehicle uses this code for an oxygen sensor heater or temperature correlation fault, it will likely cause an emissions test failure. The Check Engine Light illumination alone is grounds for automatic failure in testing regions.
Can low coolant trigger a P1119 code?
Yes, on applications where P1119 monitors the engine coolant temperature sensor. Low coolant levels can cause the sensor to read air temperature instead of fluid temperature, triggering a correlation or out-of-range fault.
Does clearing the battery fix a P1119 code?
Disconnecting the battery may temporarily clear the code from the computer’s memory, but it does not repair the underlying electrical or mechanical fault. The code will return once the monitor runs again.
Can I drive my car with a P1119 code?
It depends on the application. If the code relates to an engine coolant temperature fault, the cooling fans may not operate correctly, risking overheating. If it relates to an intake air sensor, it should be diagnosed promptly.
What Should You Do About the P1119 Code?
Confirm the exact factory definition for your specific vehicle, then follow the applicable manufacturer diagnostic procedure. Because P1119 is manufacturer-specific, the relevant system and components must be verified before any testing begins. Proper diagnosis ensures you address the actual root cause.
