Anyone Have The Follow Fault Codes?

Hello all,

My check engine light comes and goes normally but has finally decided to stay on. I scanned it with my bavarian technic tool and found the codes 4D02 and 4804. It's in German but translated it says, "Reducing-agent pressure buildup".

Anyone know which SCR pipe would have the buildup? I've about had it with this car.

Have you had the recalls done? If not, get it done - they change the injector. If yes, you should be covered by BMW's warranty on replacement parts.

If you're below 70K miles and in one of the 13 CA emissions states (Maryland is one), you're covered, too.

Closest fault codes I see on the list are:

4D03 Exhaust Backpressure Sensor Bank 1

4803 Torque Control ACC

480A DPF -Bank 1

I'd say it's related to your DPF.

Fault codes 4D02 and 4804 are related to the urea pump under the rear of the car. The pump was not building up pressure. You have to drop the exhaust to get to the pump above the tanks. 6 hours of labor plus 300 ish for parts if you have this done out of warranty at a BWM dealer.

I'm praying for a service manual to be written for this car.

Originally Posted by elester12

Fault codes 4D02 and 4804 are related to the urea pump under the rear of the car. The pump was not building up pressure. You have to drop the exhaust to get to the pump above the tanks. 6 hours of labor plus 300 ish for parts if you have this done out of warranty at a BWM dealer.

I'm praying for a service manual to be written for this car.

Extended warranty, get it!

Originally Posted by elester12

Hello all,

My check engine light comes and goes normally but has finally decided to stay on. I scanned it with my bavarian technic tool and found the codes 4D02 and 4804. It's in German but translated it says, "Reducing-agent pressure buildup".

Anyone know which SCR pipe would have the buildup? I've about had it with this car.

I cant figure out what 4804 is and I have it showing. I also have 4A66 and 4B90. The first appears to be Power Management Vehicle Electrical system (maybe an old battery) and the second is Rail Pressure Control at Engine Start.

Originally Posted by elester12

Fault codes 4D02 and 4804 are related to the urea pump under the rear of the car. The pump was not building up pressure. You have to drop the exhaust to get to the pump above the tanks. 6 hours of labor plus 300 ish for parts if you have this done out of warranty at a BWM dealer.

I'm praying for a service manual to be written for this car.

Yikes. Any idea what parts need to be replaced, the entire DEF pump? Or just a valve cleaning?

Okay, see ETK printout below. I see two main suspects -- the pump unit (16197205041 $507.84 at Tischer) and the Supply Module (16197244137 $299.45 at Tischer), any guesses as to which would be causing a 4804 fault code?