P0147Fuel & Air Metering

O2 Sensor Heater Circuit (Bank 1 Sensor 3)

P0147 means the heater circuit of the third oxygen sensor on bank 1 has a fault. Common causes are a failed heater element, a blown fuse, or wiring problems.

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

LOW

severity

🎯 Top Causes, Ranked by Likelihood

#1Failed O2 sensor heater element$50-$300

45%

The internal heater has opened.

#2Blown fuse or relay$5-$60

25%

Loss of power to the heater circuit.

#3Wiring or connector fault$50-$300

20%

An open or corroded heater circuit wire.

🩺 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

$5-$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 P0147

1Check the O2 heater fuse and relay

2Measure heater element resistance

3Inspect heater wiring and connector

4Replace the O2 sensor if the heater is open

❓ Frequently Asked Questions

Can I drive with P0147?

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

What is the most common cause of P0147?

A failed oxygen sensor heater element is the most common cause, followed by a blown fuse.

How much does P0147 cost to fix?

A fuse is cheap; an oxygen sensor typically runs $50-$300 including labor.

🔗 Related Codes

P0135P0141P0142P0143