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P2204 Fuel & Air Metering
NOx Sensor Circuit Range/Performance Bank 2
P2204 means the NOx sensor circuit on Bank 2 is out of the expected range or performing poorly. The reading does not match commanded conditions, usually from a failing sensor or wiring.
🚗 Yes, short-term, but emissions control is degraded.
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🎯 Top Causes, Ranked by Likelihood
#1 Failing NOx sensor $200-$700
An aged or contaminated sensor reads out of range.
#2 Wiring or connector fault $50-$300
High resistance in the circuit skews the signal.
#3 Exhaust leak near sensor $50-$400
Air intrusion changes the measured NOx level.
#4 Aftertreatment system issue $300-$2000
A downstream fault affects the reading.
🩺 Common Symptoms Check engine light Reduced engine power Failed emissions test Higher NOx emissions 💰 Repair Cost: DIY vs Shop
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🔧 How to Diagnose P2204 1 Scan for related aftertreatment codes
2 Compare NOx sensor data to expected range
3 Inspect exhaust for leaks near the sensor
4 Replace the NOx sensor if out of spec
❓ Frequently Asked Questions Can I drive with P2204?
Short-term yes, but repair it soon to avoid limp mode and emissions failure.
How much to fix P2204?
Expect $400-$1000 at a shop for a NOx sensor replacement.
What causes P2204 most often?
A failing or contaminated NOx sensor on Bank 2.
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