P0144Fuel & Air Metering

O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)

P0144 means the third oxygen sensor on bank 1 reports a persistently high voltage. Common causes are a failing sensor, a short in the signal wire, or a rich mixture.

🚗 Usually driveable. Sensor 3 is a post-catalyst monitor and rarely affects drivability.

LOW

severity

🎯 Top Causes, Ranked by Likelihood

#1Faulty oxygen sensor$50-$300

40%

A biased or shorted sensor reports high voltage.

#2Short to voltage in wiring$50-$300

25%

A shorted signal wire pulls the reading high.

#3Rich fuel mixture$50-$500

15%

An actual rich condition raises the reading.

🩺 Common Symptoms

Check engine light
Failed emissions test
Catalyst monitor incomplete
Usually no drivability change
Minor economy change

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$300

Shop Cost

$100-$500

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P0144

1Read sensor 3 live data

2Inspect the signal wiring for shorts to voltage

3Check fuel trims for a rich condition

4Replace the O2 sensor if biased high

❓ Frequently Asked Questions

Can I drive with P0144?

Yes, generally. This post-catalyst sensor rarely affects drivability. Fix it for emissions.

What is the most common cause of P0144?

A failed oxygen sensor or a wiring short are the most common causes.

How much does P0144 cost to fix?

An oxygen sensor typically runs $50-$300 including labor.

🔗 Related Codes

P0142P0143P0138P0137