Audi
Front NOx sensor reading out of range. On VW group diesels the sensor may need software set-up after replacement.
P2201 fault code: what it means
P2201: Front NOx sensor reading out of range. On VW group diesels the sensor may need software set-up after replacement.
Usual causes, most likely first
- failed NOx sensor
- connector corrosion or damage
- wiring damage
P2201 by make
Mercedes-Benz
NOx sensor (upstream) reading out of range. On Mercedes BlueTEC can trigger an AdBlue no-start countdown.
Skoda
Front NOx sensor reading out of range. On VW group diesels the sensor may need software set-up after replacement.
Volkswagen
Front NOx sensor reading out of range. On VW group diesels the sensor may need software set-up after replacement.
What the repair usually costs
- AdBlue / SCR fault diagnosis (scan, NOx and doser tests)NZ$70–NZ$280 · A$80–A$300
- AdBlue tank assembly or SCR catalyst replacement (dealer part)NZ$3,150–NZ$8,600 · A$2,780–A$7,650
Not sure what P2201 means on your car? Ask Credov.
Before you clear it
Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.
Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.