Q: Bmw 335d 4D16 SCR system efficiency code

asked by on November 14, 2017

My 2011 bmw 335D ses light is on. The code reading is 4D16 SCR system efficiency. Car runs fine, what would be causing this

My car has 114000 miles.
My car has an automatic transmission.

You need to do a diagnostic check and see of NOX sensors are defective. Here is some other possible causes of code. 4D16 - ENGINE

Action In Service

Refill SCR system tank with new fluid Use diagnostic system to test SCR converter. Check metering valve. Check NOx sensors. Inspect metering module for correct installation position and contamination. If results of all tests are OK: Replace SCR converter.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

very loud squealing sound about 15 minutes after driving

Well, if you've removed the belt and still get the noise, that eliminates most of the normal causes like alternators and idler pulleys. I doubt it has anything to do with the water in the cooling system although you absolutely...

Hello, I have two questions: 1) How often the Ignition Coil needs to be replaced? and 2) This model requires grease chassis?

Hi there. The spark plugs are rated for 100,000 miles for your vehicle, so you have about 5,000 miles left on their life for a decent spark. I recommend changing the spark plugs with the OEM parts to ensure a...

Car shaking during acceleration and shifting between gears

This condition sounds like one BMW has noted on a technical service bulletin (TSB) concerning a software issue in the engine control module. There has been an updated software version developed by BMW but you will need to have this...

Related articles

A Buyer’s Guide to the 2011 Mazda RX-8
The The 2011 Mazda RX-8 is a sporty, two-door coupe that is able to seat four people (two in the front and two in the rear). While this was the final year of production for the RX-8, it definitely made...
A Buyer’s Guide to the 2011 Lincoln Town Car
2011 2011 marked the final year for Lincoln’s aging Town Car. It offered an immense amount of space in the front and the rear, as well as the iconic style for which the line was known. Key Features Perhaps...
5 Comfortable Sports Cars Your Parents Won't Complain About Riding In
The most comfortable sports cars combine high performance with a smooth ride. Options include the Alpina B6, Audi S8 Plus, and Mercedes-AMG S65.