P220BFuel & Air Metering

NOx Sensor Heater Control Circuit Bank 2

P220B means the ECM detected a fault in the NOx sensor heater control circuit on Bank 2. The heater brings the sensor to operating temperature, and a fault delays or prevents accurate NOx readings.

🚗 Yes, short-term, but emissions monitoring is affected.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Failed NOx sensor heater$200-$700

45%

The internal heater element fails open or shorted.

#2Wiring or connector fault$50-$300

30%

Corroded or damaged heater circuit wiring.

#3Blown fuse or relay$10-$150

15%

Loss of power to the heater circuit.

#4Control module fault$300-$1000

10%

Rarely, the module heater driver fails.

🩺 Common Symptoms

Check engine light
Reduced engine power
Failed emissions test
Delayed emissions readiness

💰 Repair Cost: DIY vs Shop

DIY Cost

$200-$700

Shop Cost

$400-$1000

📋 Free OBD2 Code Cheat Sheet

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

🔧 How to Diagnose P220B

1Check the NOx heater fuse and power supply

2Inspect the heater circuit wiring and connector

3Measure heater resistance if accessible

4Replace the NOx sensor if the heater is open

❓ Frequently Asked Questions

Can I drive with P220B?

Short-term yes, but repair it to keep emissions monitoring working.

How much to fix P220B?

A NOx sensor replacement typically runs $400-$1000 at a shop.

What causes P220B most often?

A failed NOx sensor heater or heater circuit wiring.

🔗 Related Codes

P2204P220AP2200P2201P2203