[socalengineer]

Hello All,

My car, 640i, had the HPFP replaced and since then I have been throwing a 190F08 - Fuel Tank Ventilation Valve Malfunction malfunction. The mechanics have not been able to read the DME with ISTA for some weird reason it keeps freezing on them.


So they replaced:
1. Fuel tank ventilation valve
2. NVLD
3. Evap canister

Smoke tested the car. Dealer said they can’t connect to the dme via ISTA. They said I need to replace the DME for them to troubleshoot. I sent the dme over to the ecu pros and they said the dme was fine, but then cas was not coded to the car. They said that the cas unit was causing all of the issues. I got it back, and nothing changed.

Dealer and mechanic say to replace the dme. Any other ideas guys? Ecu pros will clone my dme for $1500 but they said they are not sure that’s the issue. Before HPFP install there was no code.

Car used to be programmed with bootmod3, now it’s back to stock. Mods: charge pipe, fmic, suspension, muffler.

I removed the edc module, but putting it back in has no effect on ISTA operation.

ECU Pros said they could read the dme just fine with ISTA. They said maybe my ZGW has an issue but not sure why the dealer can’t read it with ISTA.

Any ideas guys?

Thank you

[dmaxdmax]

A good friend, an IT guy, taught me to start with basics, like a bad cord. Somehow politely suggest the dealer try a different cord.

[AdolfoMolinaM]

Hello everyone, this may be an old topic but I want to leave my contribution because I did not find the solution online to the fault 190F08.

After 5 months trying to solve the error, I was finally able to solve it. I changed the purge valve, changed the DMTL pump, and checked all the pipes and seals, I also tested it with a smoke leak detector and everything was functional and no leaks.

I literally tried everything and gave up. After I tried everything I could, I ended up taking my BMW X3 F25 2017 N20 to a BMW specialized workshop. What they told me was to change the purge valve (again) for an original and new one. The one I had bought was original but used.

I decided to buy the new one and try again. But after 4 days the CEL Check engine light came back on with the same fault (190F08).

This frustrated me and I decided to check EVERYTHING again. In this case I also checked other additional components and found that the plugs of the two differential pressure sensors were swapped. I realized this because the two plugs have the same connection, they are next to each other BUT one of the plugs (which is after the throttle) has a clip on the cable to attach it to a part of the engine. Since they were in alternate positions, the clip was not attached anywhere and there was no way to hold it. When I saw that, I decided to change their position and look online for a picture of these sensors. There is one that says "3.5" and the other does not say anything. The 3.5 is high pressure so it goes on the intake side before the throttle, and the other one that does not say anything is low pressure and goes after the throttle.

When I changed them according to the internet picture and the correct way of the harnesses, I proceeded to turn on the vehicle and it threw a lot of errors and turned off. Then with ISTA software I reset the ADAPTATION VALUES of the DME so that it would recalibrate the sensors, the fuel mixture and the EVAP system.

And BOOOM, problem solved.

I think this is a common issue because the sensors look the same, have the same connection and are close to each other.

This whole problem was because some workshop swapped the sensors after disassembling that area of the engine and recalibrated the DME to work that way.

I hope this helps someone who is having the same problem.