P2A39 — O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 3

What Does P2A39 Mean?

P2A39 is a diagnostic trouble code indicating: O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 3. This code relates to the vehicle systems system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P2A39

⚠️ Check Engine Light (MIL) illuminated
⚠️ O2 Sensor Positive Current reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ System warning light illuminated

Common Causes

🔍 Open or broken wire in O2 Sensor Positive Current circuit
🔍 Poor ground connection at O2 Sensor Positive Current
🔍 Faulty O2 Sensor Positive Current with no output signal
🔍 Disconnected or loose O2 Sensor Positive Current connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P2A39 mean?

P2A39 indicates: O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 3. The vehicle's computer has detected that the O2 Sensor Positive Current is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P2A39?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P2A39 for extended periods may cause additional problems.

How much does it cost to fix P2A39?

Repair costs for P2A39 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 O2 Sensor Positive Current circuit
🔧 Clean and secure O2 Sensor Positive Current connector and ground points
🔧 Replace failed O2 Sensor Positive Current

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.

P2A39: O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 3