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1682: DEF system fault (repeat occurrence / contamination troubleshooting)
Quick Answer
DEF system fault (repeat occurrence / contamination troubleshooting)
Code
1682
Severity
Warning
Applies to
Check OEM application
Can I drive?
Driving suitability is not established by this code alone.
Common Symptoms
- Aftertreatment faults persist
- May stack with heater/quality faults in winter
Likely Causes
- DEF contamination
- Debris affecting dosing components
Common Fixes
- System inspection/cleaning
- Verify dosing and sensor readings
- Use OEM procedure for repeat occurrences
Full technical sections↓
What does 1682 mean?
Back to top ↑DEF system fault (repeat occurrence / contamination troubleshooting)
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Mechanic community notes for 1682
Back to top ↑Real-world tips from technicians. Submissions are moderated to keep spam and “my cousin fixed it with duct tape” content out.
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