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What happens if you run out of DEF?
A warning light showed up on my dashboard this morning and after reading my manual, I learned that it means my car is low on diesel exhaust fluid (DEF). I’ve never seen this light show up before and I don’t know what to do about it. What happens if my car runs out of DEF?
Kara Vanderbeek · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Oh no! Having a warning light on your dashboard is never an encouraging sign. If you run out of DEF, you can usually get by with the simple fix of refilling the tank and restarting your vehicle.
However, if your vehicle regularly runs out of DEF, you may be looking at a bigger problem. In some cases, this can cause your exhaust system to clog with debris, impacting your engine’s ability to run efficiently, and eventually, causing your vehicle to break down.
In essence, DEF is a necessary component to the smooth operation of your vehicle, and you won’t be able to use your vehicle until you’ve refilled the tank. If you let your tank run dry, you may face serious consequences of hefty costs for repairs and replacement parts.
After you’ve refilled your DEF, ensure you’re protected on the road with the right
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