P2202: NOx Sensor Circuit Low Voltage (Bank 1, Sensor 1)
2 vehicles · 2 makes · $250-$1,200 repair
Most Reported On
P2202 is an OBD-II diagnostic trouble code meaning “NOx Sensor Circuit Low Voltage (Bank 1, Sensor 1).” The PCM has detected that the signal voltage from the NOx (nitrogen oxide) sensor on Bank 1, Sensor 1 is lower than the expected operating range. The NOx sensor measures nitrogen-oxide content in the exhaust to manage the aftertreatment system (SCR/DEF on diesels or lean-burn emission control), so a low-voltage fault means the engine controller can no longer trust that reading. This is primarily a diesel and lean-burn emissions code and typically triggers reduced-emissions or limp-mode behavior. This code is most commonly reported on 2017-2023 Opel Grandland (1.5 Diesel BlueHDi, 1.6 Diesel), and 2015-2020 Mercedes-Benz V-Class (V200 d, V220 d, V250 d), with repair costs ranging from $250 to $1,200.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P2202, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (2)
FAQ
What does P2202 mean?
P2202 stands for "NOx Sensor Circuit Low Voltage (Bank 1, Sensor 1)." The PCM has detected that the signal voltage from the NOx (nitrogen oxide) sensor on Bank 1, Sensor 1 is lower than the expected operating range. The NOx sensor measures nitrogen-oxide content in the exhaust to manage the aftertreatment system (SCR/DEF on diesels or lean-burn emission control), so a low-voltage fault means the engine controller can no longer trust that reading. This is primarily a diesel and lean-burn emissions code and typically triggers reduced-emissions or limp-mode behavior.
What are the most common causes of P2202?
The most common causes of P2202 are: Failed or contaminated NOx sensor element (Bank 1, Sensor 1), Short to ground or low resistance in the NOx sensor signal or supply wiring, Corroded, loose, or damaged sensor connector / pins, Open or high-resistance ground or reference circuit causing low signal, Exhaust leak or soot/sulfur contamination affecting the sensor, Faulty NOx sensor control module or PCM/ECM (less common). The specific cause varies by vehicle.
How much does it cost to fix P2202?
Repair costs for P2202 range from $250 to $1,200, depending on the vehicle and root cause.
Which vehicles are affected by P2202?
Au7o has documented P2202 across 2 vehicle models from 2 manufacturers: Mercedes-Benz, Opel.
Sources (5)
- ForumGrandland X Emissions Fault Starting Impossible - Vauxhall Owners Network
- articleOpel AdBlue System Issues and Solutions - otoideal
- articleMercedes AdBlue Delete - Fix No-Start & Countdown Issues (Stoke Tuning)
- ForumW447 V-Class AdBlue Countdown Reset - autogmt.com
- articleMercedes Benz P229F62 and P2202 error codes explained - Xenons4U
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.