Catalyst Temperature Sensor Circuit Bank 1 Open (Generic)
The P4016 code means the vehicle's onboard diagnostic system has detected: Catalyst Temperature Sensor Circuit Bank 1 Open (Generic). This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $100 - $400 (parts and labor)
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Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
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Common Symptoms
- Check Engine Light on
- Catalyst monitoring disabled
- Reduced engine power
- Failed emissions test
- Service engine warning
Probable Causes (Ranked by Likelihood)
- Open circuit in catalyst temperature sensor wiring Very High
- Failed catalyst temperature sensor High
- Damaged connector at catalytic converter Moderate
- PCM input circuit failure Low
Step-by-Step Diagnostic Procedure
-
Check catalyst temperature sensor resistance
-
Inspect wiring from sensor to PCM
-
Verify connector integrity near catalytic converter
-
Test PCM input for catalyst temp signal
Frequently Asked Questions
What does a catalyst temperature sensor do?
It monitors the temperature of the catalytic converter to ensure it is operating within the proper range. Overheating can destroy the converter.
Can I drive with P4016?
No, the vehicle may enter reduced power mode. Without catalyst temperature monitoring, the converter could overheat and be damaged.
How much is a catalyst temperature sensor?
The sensor costs $40-100. With labor to access it near the catalytic converter, total repair is $150-400.
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