What it means
The DOR catalyst temperature sensor signal jumps or drops out — typically loose connectors or chafed wiring near the radiator pack.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The DOR catalyst temperature sensor sends a temperature signal to the engine control module. P2571 sets when that signal changes unpredictably or drops out, rather than staying consistent enough for the module to use.
Common causes
Most likely first.
- Loose connector
- Chafed harness
- Connector with intermittent contact under vibration
Symptoms
- Check engine light
How to diagnose it
- Review freeze-frame data and graph the DOR temperature signal on a scan tool to look for sudden jumps or dropouts.
- Inspect the sensor connector and harness near the radiator pack for looseness, chafing, heat damage, or contact with moving parts.
- With the signal displayed, gently move the accessible harness and connector to see whether the reading cuts out.
- Check connector pin fit and test the signal, return, and reference circuits for intermittent continuity using the wiring diagram.
- If the wiring remains stable, test the temperature sensor and control-module connection against the manufacturer's specifications.
Common fixes
- Secure a loose sensor connector.
- Repair chafed wiring and route it clear of rubbing or vibrating parts.
- Clean or replace terminals with intermittent contact.
- Replace the DOR temperature sensor if its signal drops out despite sound wiring.
Can I keep driving?
The listed symptom is a check-engine light, and no limp mode is indicated, so driving is generally possible if the vehicle behaves normally. The temperature input may become unreliable and prevent the DOR monitor from running.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.