Your Sprinter has upstream and downstream NOx sensors that measure emissions before and after the catalyst. They are a common failure point and trigger the DEF countdown. We test which sensor is at fault and replace and code the correct one.
Signs You Need NOx Sensor Calibration & Replacement
If your Sprinter shows any of the following in Orange County traffic or on the freeway, it is time to have this checked:
- Emissions or DEF warning light
- NOx sensor fault codes
- Restart countdown active
- Reduced power in limp mode
What Our NOx Sensor Calibration & Replacement Includes
- Upstream and downstream NOx diagnosis
- Live-data plausibility check
- OEM NOx sensor replacement
- Sensor coding and adaptation
- Drive-cycle verification
Ballpark Pricing
Ballpark: $450 to $1,200 per sensor. Sprinter pricing varies with model year, parts, and condition, so we always confirm a firm price before starting. See our pricing page for more ranges, or call (714) 646-1433 for an exact quote.
Why Orange County Sprinter Owners Trust Us for NOx Sensor Calibration & Replacement
NOx Sensor Calibration & Replacement on a Mercedes Sprinter is not the same as a generic van repair. We diagnose with real Mercedes Xentry equipment, use OEM and OE-quality parts, and fix the root cause so the problem does not come back. Drivers across Anaheim, Irvine, and all of Orange County bring us their diesel, gas, and eSprinter vans because we do the job right the first time and stand behind our work.