P042C — Catalyst Temperature Sensor Circuit Low Bank 1 Sensor 2

What Does P042C Mean?

P042C is a diagnostic trouble code indicating: Catalyst Temperature Sensor Circuit Low Bank 1 Sensor 2. This code relates to the emission controls system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P042C

⚠️ Check Engine Light (MIL) illuminated
⚠️ Catalyst Temperature Sensor reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Failed emissions test

Common Causes

🔍 Open or broken wire in Catalyst Temperature Sensor circuit
🔍 Poor ground connection at Catalyst Temperature Sensor
🔍 Faulty Catalyst Temperature Sensor with no output signal
🔍 Disconnected or loose Catalyst Temperature Sensor connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P042C mean?

P042C indicates: Catalyst Temperature Sensor Circuit Low Bank 1 Sensor 2. The vehicle's computer has detected that the Catalyst Temperature Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P042C?

Yes, P042C is generally safe to drive with in the short term. However, it should still be addressed to pass emissions testing and prevent potential secondary issues.

How much does it cost to fix P042C?

Repair costs for P042C typically range from $20 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Repair broken wire or restore ground in Catalyst Temperature Sensor circuit
🔧 Clean and secure Catalyst Temperature Sensor connector and ground points
🔧 Replace failed Catalyst Temperature Sensor

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P042C: Catalyst Temperature Sensor Circuit Low Bank 1 Sensor 2