Code result
P2571
Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic
Moderate severity
What it means
The DOR catalyst temperature sensor signal jumps or drops out — typically loose connectors or chafed wiring near the radiator pack.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Loose connector
highOne of the most commonly reported causes for this code — check this first.
Chafed harness
mediumA plausible cause — test and verify before replacing parts.
Connector with intermittent contact under vibration
lowLess common, but worth ruling out after the more likely causes.
Related help
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