P11DC on 2017-2023 Opel Grandland (1.5 Diesel BlueHDi, 1.6 Diesel) — NOx Sensor 2 Current Performance (Bank 1 Sensor 2)
1 vehicles · 1 makes · $250-$1,200 repair
Most Reported On
P11DC is an OBD-II diagnostic trouble code meaning “NOx Sensor 2 Current Performance (Bank 1 Sensor 2).” P11DC indicates the engine control module has detected a current/performance fault with the downstream Nitrogen Oxide (NOx) sensor (Sensor 2, Bank 1), part of the Selective Catalytic Reduction (SCR) emissions system. The NOx sensor module reports an out-of-range or implausible signal to the ECM over the serial data line for more than the calibrated time, and the ECM stores the code. It signals the post-catalyst NOx reading is unreliable, which can disrupt emissions control and DEF/SCR dosing on diesels. This code is most commonly reported on 2017-2023 Opel Grandland (1.5 Diesel BlueHDi, 1.6 Diesel), with repair costs ranging from $250 to $1,200.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P11DC, 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
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FAQ
What does P11DC mean?
P11DC stands for "NOx Sensor 2 Current Performance (Bank 1 Sensor 2)." P11DC indicates the engine control module has detected a current/performance fault with the downstream Nitrogen Oxide (NOx) sensor (Sensor 2, Bank 1), part of the Selective Catalytic Reduction (SCR) emissions system. The NOx sensor module reports an out-of-range or implausible signal to the ECM over the serial data line for more than the calibrated time, and the ECM stores the code. It signals the post-catalyst NOx reading is unreliable, which can disrupt emissions control and DEF/SCR dosing on diesels.
What are the most common causes of P11DC?
The most common causes of P11DC are: Failed or aged downstream NOx sensor (Sensor 2 / Bank 1 Sensor 2), Damaged, corroded, or loose NOx sensor wiring, connector, or serial data line, Exhaust leak near the SCR catalyst or sensor location skewing readings, Contaminated or degraded SCR/DEF catalyst affecting NOx conversion, Engine performance/combustion issues (misfire, EGR fault) raising actual NOx, Faulty NOx sensor control module or ECM software fault. The specific cause varies by vehicle.
How much does it cost to fix P11DC?
Repair costs for P11DC range from $250 to $1,200, depending on the vehicle and root cause.
Which vehicles are affected by P11DC?
Au7o has documented P11DC across 1 vehicle models from 1 manufacturers: Opel.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.