Exhaust Gas Temperature Sensor 1
This code indicates a fault with Exhaust Gas Temperature Sensor 1.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The exhaust gas temperature sensor measures how hot the exhaust gases are after they leave the engine, which helps the computer manage emissions and performance. If this sensor fails, it might think the exhaust is either too hot or too cold, which can affect how the engine runs.
What the computer is actually seeing
The computer expects a voltage signal from the sensor that corresponds to a temperature range of about 200 to 1200 degrees Fahrenheit (93 to 649 degrees Celsius).
What a healthy reading looks like
Typical voltage output for the exhaust gas temperature sensor should be around 0.5V to 2.5V corresponding to the temperature range mentioned.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring and connectors for the exhaust gas temperature sensor for damage or corrosion. If found, repair or replace.
- 22. Measure the voltage at the sensor connector with the engine running. It should range from 0.5V to 2.5V depending on exhaust temperature. If not, proceed to the next step.
- 33. Remove the exhaust gas temperature sensor and check it for physical damage or carbon build-up. If it's dirty, clean it; if damaged, replace it.
- 44. Conduct a fault code scan to see if any additional related codes are present. Address any other concurrent codes accordingly.
Common causes
- Wiring issues such as breaks or corrosion
- Faulty exhaust gas temperature sensor
- Poor connections or loose wiring
- Exhaust leaks affecting sensor readings
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's a moderate issue, so the vehicle is drivable, but it may impact performance and emissions. Get it checked soon.
Will this problem come back after I fix it?
If the sensor is replaced and wiring is secure, it shouldn't come back unless there's another underlying issue.
Why does this code show with others like SPN 4352?
Multiple codes usually indicate related systems malfunctioning; checking and fixing one could resolve the others.
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