OBD-II Code · Sensors
P2200
NOx Sensor Circuit (Bank 1 Sensor 1)
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$300–$1,800
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Diesel NOx sensor circuit fault.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
- DEF warnings
- Reduced-power countdown
Likely causes
- Failed NOx sensorMost common
- Wiring
- CAN bus
Read the full diagnostic procedureP2200 sets when the bank 1 upstream NOx sensor circuit is malfunctioning — typically a dead sensor, open or shorted signal line, failed heater, or co…
P2200 sets when the bank 1 upstream NOx sensor circuit is malfunctioning — typically a dead sensor, open or shorted signal line, failed heater, or communication failure on the dedicated CAN bus that most modern NOx sensors use to report to the engine controller. NOx sensors live in diesel and lean-burn gasoline exhaust streams and measure nitrogen-oxide concentration alongside lambda, reporting current through the pumping cell in the 0-10 mA range corresponding to lambda 0.7-1.3 and NOx ppm from zero to several hundred parts per million. The sensor element runs at roughly 800°C and needs a long heater warm-up cycle (60-120 seconds) before producing valid data, which is why P2200 often sets paired with heater-circuit codes and only after the vehicle has been driven for several minutes.
Cheapest-first ladder
- scan the NOx sensor live data PID — a healthy sensor reads ~lambda 1.0 with NOx near zero immediately after a regen cycle, climbing under load; a flat-line zero or pegged value with no variation is a dead sensor.
- Inspect the harness and connector at the sensor for chafe and road-salt corrosion (these sensors hang off the exhaust under the chassis).
- Check the dedicated CAN bus connections with a scope — a single broken twisted-pair wire kills the sensor's reporting even with the element fully alive.
- On most modern setups the NOx sensor + its dedicated controller module are sold as one assembly, which is why this repair gets expensive fast.
Vehicle-specific patterns2009-2015 VW/Audi 2.0L TDI (Jetta, Passat, A3, Q5) is the most common P2200 in North American shops post-Dieselgate — the OEM Continental NOx sensor…
- 2009-2015VW/Audi 2.0L TDI (Jetta, Passat, A3, Q5) is the most common P2200 in North American shops post-Dieselgate — the OEM Continental NOx sensor fails predictably around 80k-120k miles, made worse by the post-settlement software updates that increased dosing demand on the SCR system; OEM sensor assembly runs $600-$900 and the upstream unit is far more common than the downstream.
- 2007-2014Mercedes-Benz BlueTEC OM642 (ML320/ML350 BlueTEC, GL320/GL350, E320/E350 BlueTEC) throws P2200 routinely on the same 80k-120k window — Bosch sensor + controller assembly is a $700-$1,000 part.
- 2011-2016GM Duramax LML/L5P (Silverado HD, Sierra HD) throws P2200 from harness chafe at the upstream NOx sensor bracket near the DPF inlet, plus genuine sensor failure around 100k miles; aftermarket sensors exist but OEM is the durable choice.
- 2013-2018RAM Cummins 6.7L throws P2200 from a TSB-acknowledged harness chafe at the bracket and from the upstream NOx sensor itself failing around 80k miles.
Estimated repair$600 to $1,400.
Look up another code
P2200 — frequently asked
What does a P2200 code mean?
Diesel NOx sensor circuit fault.
What causes a P2200 code?
Common causes: Failed NOx sensor; Wiring; CAN bus.
What are the symptoms of a P2200 code?
Typical symptoms: Check engine light; DEF warnings; Reduced-power countdown.
Is it safe to drive with a P2200 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $300-$1,800.
How do I diagnose a P2200 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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