P1119: Manifold Air Temp Sensor Out of Range High
The P1119 code indicates that the Engine Control Module (ECM) has detected a signal from the Manifold Air Temperature (MAT) sensor that is above the expected voltage range, typically corresponding to an air temperature reading that is too high or a sensor circuit fault. This can be caused by a faulty sensor, wiring issues, or a short circuit. The MAT sensor is a thermistor that changes resistance with temperature; a high voltage reading suggests low resistance, which could be due to a short to ground or a sensor stuck in a high-temperature state.
01. Most Common Causes
- Faulty Manifold Air Temperature sensor
- Short circuit in the sensor wiring or connector
- Corrosion or damage to the sensor connector
- ECM software or hardware issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor engine performance, hesitation, or stalling
- Increased fuel consumption
- Rough idle or hard starting
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the MAT sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Measure the sensor's resistance with a multimeter and compare to manufacturer specifications (typically 2-10 kΩ at room temperature).
Step 4: Check for a short to ground or power in the sensor circuit by disconnecting the sensor and testing the harness side.
Step 5: If sensor and wiring are okay, test the ECM's ability to read the sensor by monitoring live data with a scan tool.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code as it can cause poor engine performance, increased fuel consumption, and potential damage to the catalytic converter. You should have it diagnosed and repaired as soon as possible.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on whether the sensor needs replacement or just a wiring repair. The sensor itself is usually inexpensive (around $20-$50).