2017 F-Super Duty/2016-2017 F-650/F-750 – 6.7L – Inaccurate DEF Level Indication And/Or Message – With Or Without Illuminated MIL – DTC P203B
Some 2017 F-Super Duty and 2016-2017 F650/F750 vehicles equipped with 6.7L engine may exhibit an inaccurate diesel exhaust fluid (DEF) level indicator or warning message with or without an illuminated malfunction indicator lamp (MIL) and diagnostic trouble code (DTC) P203B.
This concern may be due to intermittent loss of signal from the reductant level sensor that is integrated into the reductant tank.
If the applicable pinpoint test in the powertrain control/emission diagnostic (PC/ED) or workshop manual (WSM) directs replacement of the integrated reductant level sensor, do not attempt any repairs at this time and release the vehicle.
Engineering is currently investigating this concern, monitor OASIS for updates regarding latest information and diagnostic direction.
- Formulated to work with all SCR-equipped diesel engines
- Safe, easy-to-handle, nontoxic solution of 67.5% water and 32.5% automotive grade urea
- Certified to meet all API & ISO 22241 requirements
- Compatible with AdBlue and other DEF products
- DEF is a consumable and essential fluid for maintaining SCR-equipped modern diesel engines; contains 30-50ppm bitterant
Last update on 2026-06-18 / Affiliate links / Images from Amazon Product Advertising API
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- ENGINEERED: For use in Selective Catalytic Reduction (SCR) systems on diesel engines
- EFFICIENCY: BlueDEF diesel exhaust fluid is key to helping improve fuel economy by up to five percent
- PROTECTION: Diesel exhaust fluid is non-toxic and safe to handle
- QUALITY: Stable, colorless and odorless, and also meets ISO Standards 22241 for purity and composition
- EFFORTLESS: Easily Inject the fluid into your exhaust stream with a specialized dosing module
Last update on 2026-06-18 / Affiliate links / Images from Amazon Product Advertising API
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