P23C1 — NOx Sensor Performance - Sensing Element Bank 1 Sensor 3

What Does P23C1 Mean?

P23C1 is a diagnostic trouble code indicating: NOx Sensor Performance - Sensing Element Bank 1 Sensor 3. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P23C1

⚠️ Check Engine Light (MIL) illuminated
⚠️ NOx Sensor not meeting expected output
⚠️ Degraded performance of related system
⚠️ Reduced engine performance

Common Causes

🔍 NOx Sensor degraded from age or contamination
🔍 Mechanical wear in NOx Sensor or related parts
🔍 Restriction or blockage affecting NOx Sensor
🔍 Calibration drift in NOx Sensor

Frequently Asked Questions

What does P23C1 mean?

P23C1 indicates: NOx Sensor Performance - Sensing Element Bank 1 Sensor 3. The vehicle's computer has detected that the NOx Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P23C1?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P23C1 for extended periods may cause additional problems.

How much does it cost to fix P23C1?

Repair costs for P23C1 typically range from $50 to $400, 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

🔧 Inspect NOx Sensor for contamination or wear
🔧 Replace NOx Sensor
🔧 Address any related mechanical faults

1
Find your vehicle above
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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.

P23C1: NOx Sensor Performance - Sensing Element Bank 1 Sensor 3