P20F4
Reductant Consumption Too Low
P20F4 is an OBD-II diagnostic trouble code meaning: Reductant Consumption Too Low. Common causes: low adblue level in tank, reagent pump malfunction. Estimated repair cost: $28–167.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Low AdBlue level message (even with a full tank)
- The engine may go into emergency mode
Causes
- Low AdBlue level in tank
- Reagent pump malfunction
- SCR injector clogged
- Problems with NOx sensors
- Open circuit or wiring fault
How to Fix
- Check AdBlue level and top up if necessary
- Diagnose the reagent supply pump
- Check and, if necessary, clean or replace the SCR injector
- Scan the system for other fault codes
- Check the condition of wiring and connections to SCR system components
Related codes
Error P20F4 by Vehicle Brand
FAQ
What does the P20F4 code mean?
P20F4 is an OBD-II diagnostic trouble code that indicates: Reductant Consumption Too Low
What causes a P20F4 error code?
The most common causes of P20F4 include: Low AdBlue level in tank; Reagent pump malfunction; SCR injector clogged; Problems with NOx sensors.
How do I fix a P20F4 diagnostic trouble code?
To fix P20F4: Check AdBlue level and top up if necessary. Diagnose the reagent supply pump. Check and, if necessary, clean or replace the SCR injector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20F4?
Yes, but get it checked soon
How much does it cost to fix P20F4?
The estimated repair cost for P20F4 is $28–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat