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An intermittent ECT can cause cold-start no-runs, fan misbehavior, and lousy fuel economy. Cracked sensor housings from heat cycling are very common - inspect for hairline cracks before replacing. See ECT sensors on Amazon ↗
🗺️ Where Is the Problem?
Blueprint view - P0119 fault zone in the engine and emissions control system
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 P0119 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
50%
#1 - Most Likely
Cracked ECT Sensor
Heat cycles crack the plastic body of the ECT sensor. Coolant intrusion or vibration causes the thermistor to make contact intermittently. Replace the sensor and inspect for coolant in the connector.
🔧 Part
$15–$60
👨🔧 Labor
$40–$120
⚡ DIY Difficulty
Easy
30%
#2 - Check First
Corroded Connector
Coolant seepage into the ECT connector corrodes pins. The signal becomes intermittent under vibration. Clean and seal with dielectric grease, or replace the pigtail.
🔧 Part
$10–$40
👨🔧 Labor
$40–$120
⚡ DIY Difficulty
Easy
15%
#3 - Less Common
Wiring Harness Damage
A chafed or melted wire near hot exhaust components breaks the ECT signal. Repair the wire and route it away from heat sources, adding heat shielding if needed.
🔧 Part
$10–$40
👨🔧 Labor
$60–$180
⚡ DIY Difficulty
Medium
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Datalog ECT during a drive - Watch for sudden drops or spikes. A clean signal climbs steadily on warm-up and stabilizes around 195°F.
- Inspect sensor for cracks - Pull the sensor and check the body and o-ring. Any visible crack or coolant in the connector means replacement.
📍 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