Q: Bmw 335d 4D16 SCR system efficiency code
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.
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
What others are asking
Hydraulic lift gate not working
The lift gate could have many problems that might cause it not to work. I would recommend taking the truck to the lift gate manufacturer or the dealership to have them look over the problem. They will have all the...
Intermittent high revving
Hello there, thanks for writing in about your 2004 Chevrolet Aveo5. While a revving engine is not a normal operation, there are a few common causes for this type of fault. The most common are a vacuum leak, oxygen sensor...
My axle clicks while I drive not while turning and is not loud I know I need an axle but how long do I have.
The part that does the clicking is the Constant Velocity (CV) Joint. Your car has four of them. When the joints start to fail, they usually click when you are making sharp turns. A joint that is clicking while you...
How involved is changing the thermostat on a 2004 Nissan Pathfinder?
Replacing the thermostat on this model of Pathfinder is a relatively simple procedure, not much different from other vehicles. The first step is to drain the coolant to a sufficiently low level. Once the coolant is drained, the thermostat can...
The check engine light comes on when turning the steering wheel.
Hi there. When the check engine light comes on when turning the steering wheel, this usually is for the power steering system (https://www.yourmechanic.com/services/power-steering-pump-replacement). There could be an issue with the power steering pump or the rack and pinion steering system....
Engine idle fluctuates and dies.
It sounds like you may have a dirty or failing idle air control valve. The idle air control valve (https://www.yourmechanic.com/services/idle-control-valve-replacement) monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds...
1993 cadillac seville motor mounts 4.9 engine
Hi there. On most GM V-8's there are four total engine mounts and two transmission mounts. If you'd like to receive a price estimate to have your engine mounts replaced, please click this link (https://www.yourmechanic.com/services/engine-mount-replacement) to be forwarded to the...
2014 Ford Fusion Stuck at Park
There are quite a few possible causes for what you are describing. For example, in order to shift a vehicle out of park, you must step on the brake. If you have a faulty brake light switch, the shifter is...
Related articles
A Buyer’s Guide to the 2012 BMW 5-Series
BMW BMW has built a reputation for refined engineering, powerful performance and excellent fit and function. That’s exactly what you’ll find with the 2012 BMW 5-Series sedans. Composed and powerful, they provide a range of price points, features and capabilities...
The Best Used Cars to Buy If You Live in a Windy Area
If If you live in a windy area, one of the most important things you’re going to be looking for in a used vehicle is the ability to remain stable on the road on even the most blustery days. That...
The Best Used Cars to Buy If You Live in a Tropical Climate
If If you live in a tropical climate, most of your vehicle purchasing concerns will be essentially the same as if you lived anywhere else – you want a car that looks good, offers decent gas mileage, and suits the...
Browse other content
Maintenance
Cities