Reductant Quality Sensor Range/Performance Problem
The reductant quality sensor detects issues with the DEF fluid quality.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer checks the quality of the diesel exhaust fluid (DEF) you're using. If it finds that the fluid isn't up to standard, it throws this code.
What the computer is actually seeing
The reductant quality sensor measures the conductivity or other properties of the DEF fluid in the tank and compares it to expected values.
What a healthy reading looks like
Expected conductivity values for quality DEF should be between 1000-1500 µS/cm; lower or higher indicates bad fluid.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the DEF fluid level. It should be over the minimum mark on the tank, typically above 1/4 full.
- 2Inspect the DEF fluid for contamination or improper usage (like using water instead of pure DEF).
- 3Test the conductivity of the DEF fluid using a meter. It should read between 1000-1500 µS/cm; if outside this range, replace the fluid.
- 4Check the wiring and connectors to the reductant quality sensor for damage or corrosion. Repair if necessary.
- 5If all checks out but the code persists, replace the reductant quality sensor.
Common causes
- Poor quality or contaminated DEF fluid
- Faulty reductant quality sensor
- Wiring issues or connector problems
- Low DEF fluid level
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but fix it soon to avoid emissions issues.
Will this code come back after clearing?
If the issue isn't fixed, yes, the code will likely reappear.
Why does this code sometimes pair with others?
It can occur with other faults indicating DEF or SCR system problems.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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