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P0113 is confirmed with live IAT data. A Bluetooth OBD2 scanner showing IAT value at startup - if it reads over 200°F with a cold engine, the sensor or wiring has an open circuit. A good sensor reads close to ambient temperature when cold. See top-rated scanners on Amazon ↗
🗺️ Where Is the Problem?
Blueprint view - P0113 IAT sensor high input; sensor in air intake reads 250°F+ at cold start, indicating open circuit or failed thermistor
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0113 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
55%
#1 - Most Likely
Failed IAT Sensor
The thermistor element inside the sensor has failed open, causing maximum resistance and a sky-high temperature reading. Inexpensive and straightforward to replace.
Estimated Cost
$20–$80
Repair Type
DIY
30%
#2 - Check First
Open Circuit in Sensor Wiring
A broken wire or damaged connector between the sensor and ECM creates the same "maximum resistance" signal as a failed sensor.
Estimated Cost
$30–$150
Repair Type
DIY/Shop
12%
#3 - Less Common
Corroded Sensor Connector
Green corrosion at the 2-pin connector creates high resistance, mimicking a failed sensor. Clean with electrical contact cleaner.
Estimated Cost
$10–$50
Repair Type
DIY
3%
#4 -
ECM Input Fault
Rare. Only consider after confirming sensor, wiring, and connector are all good.
Estimated Cost
$300–$1,500
Repair Type
Shop
🔧 Step-by-Step Diagnosis
- Check live IAT data at cold start - If reading 250°F+ with a cold engine, the circuit has an open. This single reading narrows it to sensor, connector, or wiring.
- Measure sensor resistance - Unplug the IAT connector and measure resistance across the sensor terminals - should be 2,000–3,000 ohms at room temperature. Infinite resistance = failed sensor.
🚗 Most Affected Vehicles
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need