Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Control, FLEXIFUEL (B5254T8)
The fuel's ethanol content is calculated by the Engine control module (ECM) according to the same principle as other fuel adaptations.
The calculated value is stored in RAM and is saved to EEPROM after running. If this value, for one reason or another, does not correspond with the true ethanol content in the tank this can have a negative effect on the vehicle's drivability.
Therefore, incorrect ethanol content, among others, may be a cause of a diagnostic trouble code being generated, but there are no diagnostic trouble codes that directly disclose if the calculated value is correct.
The vehicle can also work well with an incorrectly calculated ethanol content.
In order to rectify the problem of incorrectly calculated ethanol content there is a possibility to calculate the true value, and to program in the new correct content.
For more information, refer to: FUNCTION , as well as Diagnostic trouble code information for diagnostic trouble codes in the diagnostic tool's information manager.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.