P2209

NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Increased NOx emissions
Check Engine light comes on
Reduced engine performance
Increased fuel consumption
Unstable engine idling

Causes

NOx sensor malfunction
Open or short circuit in the NOx sensor heater circuit
Problems with the heater circuit relay or fuse
Engine control unit (ECU) malfunction
Corroded or damaged electrical connectors

How to Fix

Check the continuity of the NOx sensor heater circuit
Check fuses and relays associated with the heater circuit
Inspect electrical connectors for corrosion or damage.
Test the NOx sensor and replace if necessary
Check and update ECU software if necessary

Related codes

P2208 P2210 P2211