Faulty intake air temperature sensor located in the dynamic chamber; Damaged or corroded wiring harness or connector at the IAT sensor; Open or short circuit in the signal or ground circuit between the sensor and PCM; Intake manifold vacuum leak causing incorrect temperature readings; Contamination or oil buildup on the sensor element; PCM internal fault (rare)

DTC codes / Mazda codes / P1113

P1113 · MazdaIntake Air Temperature Sensor Signal Dynamic Chamber Circuit

P1113 on Mazda vehicles indicates that the powertrain control module (PCM) has detected an abnormal signal from the intake air temperature (IAT) sensor that is mounted in the dynamic chamber, which is the intake manifold resonance chamber. The PCM monitors the sensor's voltage and flags this code when the signal falls outside the expected range for the current engine operating conditions, typically indicating an open circuit, short circuit, or sensor failure.

SystemPowertrain

Code typeMazda specific

SeverityLow

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or stumbling immediately after a cold start
Poor fuel economy or rich-running condition
Hesitation or lack of power during acceleration
In rare cases, a no-start condition in extremely cold weather
Sometimes a slight increase in emissions due to incorrect air-fuel mixture

Common causes, most likely first

Faulty intake air temperature sensor located in the dynamic chamber
Damaged or corroded wiring harness or connector at the IAT sensor
Open or short circuit in the signal or ground circuit between the sensor and PCM
Intake manifold vacuum leak causing incorrect temperature readings
Contamination or oil buildup on the sensor element
PCM internal fault (rare)

How to diagnose and fix it

Connect a scan tool and verify the IAT sensor reading in live data; compare it to ambient temperature after a cold soak.
Visually inspect the sensor, connector, and wiring for damage, corrosion, or loose pins.
Measure the resistance of the IAT sensor with a multimeter and compare to the manufacturer's temperature-resistance chart.
Check for continuity and short circuits in the signal and ground wires between the sensor and PCM.
If the sensor is contaminated, clean it gently with electrical contact cleaner and recheck.
Replace the IAT sensor if resistance is out of specification or the signal circuit tests faulty.
Clear the diagnostic trouble code (DTC) and perform a road test to confirm the repair.

Dynamic Chamber IAT Sensor Quirks

The dynamic chamber IAT sensor is often integrated into the mass airflow (MAF) sensor on some Mazda models, so a P1113 may actually indicate a failing MAF sensor rather than a standalone IAT sensor.
A dirty or oil-soaked air filter can contaminate the IAT sensor element, causing skewed readings that set P1113 without any visible wiring damage.
Technicians sometimes overlook a poor ground connection at the intake manifold, which can mimic a faulty sensor signal and lead to unnecessary sensor replacement.
The PCM may set P1113 intermittently if the sensor connector is loose, so always wiggle-test the harness while watching live data.
This code does not always mean the sensor itself has failed; a vacuum leak at the dynamic chamber can alter the temperature reading enough to trigger the code.

Can I keep driving with P1113?

You can generally continue driving with P1113, but avoid aggressive acceleration or heavy loads until the fault is repaired, as the engine may run richer than normal and reduce fuel economy. If you notice rough running or stalling, have the vehicle inspected promptly.

Tools that help

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Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.