P2200: NOx Sensor Circuit (Bank 1)
Quick Answer
Safe to drive (short-term)
P2200 means the engine computer has found an electrical fault in the NOx sensor circuit on bank 1. A NOx sensor is a heated sensor in the exhaust that measures nitrogen oxides. It has its own control unit that sends the reading to the engine computer over the car's data bus. Diesels with an SCR system (AdBlue) usually have one sensor before and one after the SCR catalyst, and some cars with a NOx trap use them too. P2200 points to the sensor, its wiring, connector or power supply, not to a worn catalyst. Which sensor counts as bank 1 depends on the make, so confirm it with live data before ordering a part.
- Severity
- Moderate · Emissions
- Estimated repair cost
- From €40 to €1300+, varies by vehicle
€40 or €1300, depending on your car.
- Sensor adaptation after replacement (manufacturer-level software)€40–€120
- Replace NOx sensor€350–€1300
A scan shows whether P2200 is really stored on your car, which codes sit next to it and how urgent each one is.
A scan needs a Bluetooth OBD2 adapter (Bluetooth LE on iPhone), about €25-60; the built-in demo runs without one. See which adapter to buy
What does P2200 mean?
P2200 is a emissions-related diagnostic trouble code classified as moderate severity.
What are the symptoms of P2200?
- Check engine light on
- Emissions or AdBlue system warning in the instrument cluster on some cars
- Reduced power or an emergency mode on some cars
- Higher fuel use
- Often no change in how the car drives
- NOx efficiency codes such as P20EE or P2000 stored at the same time
What causes P2200?
NOx sensor worn out or fouled, by age, soot from short trips or moisture
: high
Damaged, corroded or chafed wiring or connector at the sensor, including marten bites
: high
Power supply, ground or data bus fault: the sensor's control unit is not sending its message
: medium
Exhaust leak or road-salt water at the sensor
: medium
AdBlue dosing fault leaving deposits that damage the sensor, on cars with an SCR system
: low
Wrong sensor or wrong position fitted in an earlier repair
: low
Is it safe to drive with P2200?
Generally yes, for short-term driving. You can usually keep driving for now, but do not leave it. Without a trustworthy NOx sensor the exhaust cleaning system cannot be controlled properly, so the car may run in an emergency mode, use more fuel or show an emissions warning. On cars with an AdBlue system an unresolved emissions fault can lead to a countdown after which some makes will not restart the engine, so check your handbook and book the repair soon.
How do you diagnose P2200?
- Read all stored codes and the freeze frame. Fix NOx sensor circuit, heater, power-supply and data bus codes before any efficiency code such as P20EE or P2000, because a bad NOx reading can make a good catalyst look worn. A generic OBD2 reader shows the codes, the freeze frame and standard live data. Some newer diesels also show NOx values or the AdBlue level there, but on most cars the NOx readings, heater state and dosing data need manufacturer-level software.
- Work out which sensor the code means. Cars with two NOx sensors have one before and one after the SCR catalyst, and the bank and sensor numbering differs between makes.
- Inspect the exhaust and the sensor before any deeper testing: cracks, rust, loose parts, and wiring and connectors for damage, corrosion, melting or marten bites.
- Check the sensor's power supply, ground and data bus connection against the manufacturer's specification.
- With manufacturer-level software, compare the NOx values before and after the catalyst and watch the sensor heater. An implausible value from one sensor while the other reads sensibly points to that sensor.
- On a car with AdBlue, check the fluid quality and the dosing, because poor or crystallised AdBlue and a blocked doser can give the same symptoms and damage the sensor.
- If the sensor is replaced, fit the complete unit with the correct type for that position, tighten it to the torque and with the thread compound the manufacturer specifies, and have it adapted with manufacturer-level software where required before clearing the code.
How much does P2200 cost to fix?
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Repair sensor wiring or connector | €5–€40 | €60–€180 | €65–€220 | Moderate |
| Repair exhaust leak near the sensor | €20–€100 | €60–€200 | €80–€300 | Professional |
| Replace NOx sensor | €250–€1000 | €100–€300 | €350–€1300 | Professional |
| Sensor adaptation after replacement (manufacturer-level software) | €0–€0 | €40–€120 | €40–€120 | Professional |
Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.
P2200 on specific vehicles
P2200 on BMW
BMW 520d (G30, G31)
P2200 on Mercedes-Benz
Mercedes-Benz C 220 d BlueTEC (W205)
P2200 on Volkswagen
Volkswagen Golf 2.0 TDI (EA288, SCR)
Related diagnostic codes
Common questions about P2200
- What does P2200 mean?
- P2200 means the engine computer has found an electrical fault in the bank 1 NOx sensor circuit. That covers the sensor, its heater and control unit, its wiring and connector, and its power supply. It is about the sensor circuit, not about the catalyst being worn, which has its own codes such as P20EE for SCR systems and P2000 for NOx traps.
- Can I drive with P2200?
- For a short time, yes, but not for long. The exhaust cleaning system cannot be controlled without the sensor's reading, so the car may go into an emergency mode, use more fuel or show an emissions warning. On cars with AdBlue, some makes run a countdown after which the engine will not restart if the emissions fault is not fixed. Check your handbook and get it repaired soon.
- Do I need a new NOx sensor for P2200?
- Not always. Wiring and connector damage, a power supply or data bus fault, and an exhaust leak can all set the code, and each is cheaper than a sensor. The wiring and the sensor's supply are checked before a sensor is bought. If the sensor is at fault, it is replaced as a complete unit, not in parts.
- Is P2200 the same as P20EE?
- No. P2200 is a fault in the NOx sensor circuit. P20EE means the SCR catalyst is not cleaning the exhaust well enough, judged from the NOx sensors. A faulty NOx sensor can lead to a P20EE, so the sensor code is dealt with first.
- How much does it cost to fix P2200?
- A wiring or connector repair costs about 65 to 220 EUR and an exhaust leak repair 80 to 300 EUR. A replacement NOx sensor costs about 350 to 1,300 EUR fitted, depending on the car and on whether it is the sensor before or after the catalyst. The adaptation with manufacturer-level software adds 40 to 120 EUR.
- Can a cheap OBD2 reader fix P2200?
- It can read and clear the code and show the freeze frame. On most cars it cannot show the NOx readings from the sensor or its heater state, and it cannot adapt a new sensor to the car. Those need manufacturer-level software. Clearing the code without finding the cause only brings it back.
Read our detailed guides
Sources
- hella.com hella.com/techworld/uk/technical/car-electronics-and-electrics/stickoxidsensor-n
- en.wikipedia.org en.wikipedia.org/wiki/BMW_B47
- kfz-dietrich.com kfz-dietrich.com/nox-sensor/
- en.wikipedia.org en.wikipedia.org/wiki/Mercedes-Benz_C-Class_(W205)
- carwiki.de carwiki.de/vw-ea288-motor