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.
Reducing Agent (ADBLUE®) Consumption Or Quality Checking
The following procedure is used to diagnose the Reducing Agent (AdBlue®) Consumption or Quality.
Observe all safety precautions: SAFETY PRECAUTIONS
View clean working conditions: CLEAN WORKING CONDITIONS
Prior to repair work, perform a preliminary check to verify the condition. Refer to PRELIMINARY CHECK .
The AdBlue® (reducing agent) may irritate skin or eyes. If the fluid comes into contact with skin, rinse/flush the affected area immediately with plenty of water.
The AdBlue® can decompose if opened for extended periods, or stored near hot sources. Always store in cool dry place. Do not leave container opened for any extended period. Do not use if the fluid has a strong ammonia odor or has any crystallization formed inside the container, it is aged and should NOT be used as damage to the system could occur. AdBlue® is colorless and nearly odorless when in a fresh state.
Reducing agent quality check:
-- Check the reducing agent in tank for staleness or aging. The filler cap is located under the spare tire in the rear cargo area. Remove the cap and look for signs of crystallization inside the tank or having a strong ammonia odor. If the reducing agent has gone stale (strong odor), drain the fluid from the tank and refill. If a heavy crystallization condition exists, the tank assembly should be removed and flushed with clean warm water and thoroughly drained. Dry completely as water will contaminate the reducing agent. Refill with fresh AdBlue®.
Reducing agent quantity (consumption) check:
-- The reducing agent consumption codes are rationality tests based on the reaction of the NOx sensors to an increase or decrease of the reducing injection amount. First, make sure the quality check was performed and the reducing agent is not diluted or stale. If any NOx sensor codes are set, refer to those procedures first.
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.