P0119
Fix within a few daysThe engine computer detects an intermittent or erratic signal from the Engine Coolant Temperature (ECT) sensor.
Code P0119 means your engine coolant temperature sensor is sending erratic signals. Common causes: Faulty ECT sensor (60%), wiring issues (25%), bad thermostat (10%). Drivability: Yes, for short trips, but fix within a few days. Repair cost: $40-$100 DIY, $140-$400 professional.
Can I Drive With P0119?
Yes, for short trips only
Essential trips under 10 miles, avoid highways and heavy loads. Monitor your temperature gauge.
Stop driving immediately if: Engine is overheating, Check Engine Light is flashing, you smell burning, or experience significant power loss.
Symptoms of P0119
- 1Check Engine Light is on
- 2Engine runs rough or idles poorly
- 3Poor fuel economy
- 4Engine takes a long time to warm up or overheats
- 5Cooling fan runs constantly
- 6Black smoke from the exhaust
- 7Hard starting, especially when cold
Common Causes of P0119
Parts most likely causing this code, ranked by probability
The sensor itself is faulty, sending inconsistent or incorrect temperature readings to the engine computer.
60% of P0119 cases are fixed by replacing this part
Corroded pins, a loose connection, or damaged wiring can cause intermittent signal loss or erratic readings.
25% of P0119 cases are fixed by repairing this part
A stuck-open or stuck-closed thermostat can cause actual rapid temperature fluctuations that the sensor accurately reports, but the computer interprets as an erratic sensor.
10% of P0119 cases are fixed by replacing this part
Insufficient coolant or an air bubble around the sensor can cause it to read wildly fluctuating temperatures.
5% of P0119 cases are fixed by addressing this issue
Check These First (Before Buying Parts)
- Check your engine's coolant level. Low coolant or air pockets can cause erratic readings.
- Visually inspect the ECT sensor's electrical connector and wiring for any signs of damage, corrosion, or a loose connection.
How to Diagnose P0119
- 1Check the engine coolant level and condition.
- 2Visually inspect the ECT sensor connector and wiring for corrosion, damage, or loose connections.
- 3Use a scan tool to monitor the live data stream of the ECT sensor; look for sudden, illogical temperature drops or spikes.
- 4If possible, test the resistance of the ECT sensor at various temperatures using a multimeter and compare to specifications.
- 5If the sensor and wiring appear good, test the thermostat's operation.
P0119 on Popular Vehicles
Honda Civic
2006-2024Commonly caused by a failing ECT sensor or corrosion in the sensor's electrical connector. Inspect the connector carefully.
75% fixed by replacing ECT sensor or repairing wiring
Toyota Camry
2007-2024ECT sensor failure is a frequent cause. Sometimes, a stuck-open thermostat can also trigger this code due to slow warm-up times.
70% fixed by replacing ECT sensor
Ford F-150
2004-2024P0119 on F-150s can point to the ECT sensor or a failing thermostat. Ensure the cooling system is properly bled of air after any coolant work.
65% fixed by replacing ECT sensor
Frequently Asked Questions
What does P0119 mean?
P0119 indicates that the engine's computer has detected an inconsistent or erratic signal from the Engine Coolant Temperature (ECT) sensor. This means the temperature reading is jumping around or momentarily lost.
Can I drive with P0119?
Yes, you can drive for short, essential trips, but you need to fix this within a few days. The engine computer relies on this sensor for fuel mixture and ignition timing, so ignoring it can lead to poor fuel economy, rough running, and potential damage.
Will P0119 clear itself?
No, P0119 will not clear itself. The underlying issue causing the erratic signal needs to be diagnosed and repaired. Once the repair is complete, you can clear the code with a scan tool, or it will clear after several drive cycles if the problem is resolved.
How do I fix P0119 myself?
Start by checking your coolant level and inspecting the ECT sensor's wiring and connector for damage or corrosion. If those look good, the most common fix is replacing the ECT sensor itself. If the code persists, you may need to test or replace the thermostat.
How much does it cost to fix P0119?
DIY repair costs for P0119 are typically $40-$100, mainly for a new ECT sensor and possibly some coolant. Professional repair at a shop will cost $140-$400, including parts and labor.
P0119 keeps coming back - why?
If P0119 keeps returning, it means the initial repair didn't address the root cause. This often happens if you replaced the sensor but the issue was actually in the wiring, a faulty thermostat causing real temperature fluctuations, or an air pocket in the cooling system.
Will P0119 fail emissions/smog test?
Yes, P0119 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most jurisdictions, and an erratic ECT sensor directly impacts the engine's emissions control strategy.
What's the difference between P0119 and P0118?
P0119 indicates an 'intermittent/erratic' signal from the ECT sensor, meaning the reading is unstable or jumping. P0118 indicates a 'high input' from the ECT sensor, meaning the sensor is reporting a temperature that is too high or an open circuit.
P0119 on Honda Civic?
On Honda Civics, P0119 is frequently caused by a faulty ECT sensor. The sensor itself can fail, or the wiring harness connector can become corroded or loose over time. Always check the connector first before replacing the sensor.
Questions to Ask Your Mechanic
Did you check the live data stream of the ECT sensor for erratic readings?
Good answer: Yes, I monitored the ECT sensor data with my scan tool and saw the temperature readings jumping from X to Y degrees erratically, confirming a sensor or wiring issue.
What did you find when inspecting the ECT sensor connector and wiring?
Good answer: I found some corrosion on the pins of the connector, which I cleaned, or I found a frayed wire that I repaired. The connection is now solid.
Repair Cost Estimate
DIY Repair
Parts only
$40-$100
Shop Repair
Parts + labor
$140-$400
Save $100-$300 by doing it yourself
Difficulty
beginner
Time
0.5-1.5 hours
Beginner-friendly
Cost of Waiting
Ignoring P0119 can lead to significantly reduced fuel economy, increased emissions, and a rough-running engine. If the engine runs rich due to incorrect temperature readings, it can damage your catalytic converter, turning a $50 sensor fix into a $1,200-$2,500 repair.
While You're In There...
If you're draining coolant to access the ECT sensor and your vehicle has high mileage, replacing the thermostat at the same time prevents future cooling system issues and saves on labor.
If your coolant is old or dirty, it's a good time to flush and replace it when you're already working on the cooling system.
Tools You'll Need
- Basic hand tools (wrenches, sockets)
- Pliers
- Drain pan
- Scan tool (to monitor live data and clear code)
- Multimeter (optional, for testing sensor resistance)
P0119 is a common sensor code, and the fix is usually straightforward. Most repairs are under $100 DIY, and your engine will run much more efficiently afterward.
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Your Next Steps
Step 1: Check your coolant level and inspect the ECT sensor's wiring and connector for any visible damage or corrosion. Clean any corrosion you find.
Step 2: If the wiring and coolant level are good, replace the Engine Coolant Temperature (ECT) sensor. This is the most common fix.
Step 3: If the code persists after replacing the sensor, use a scan tool to monitor live data for the ECT sensor and consider testing or replacing the thermostat.