[JAM335i]

Hi all - looking for help to keep my car running (hopefully without putting thousands more into it)...

2007 BMW 335i convertible. 145k miles.
Car was in great shape and driving perfectly.

Chain of events:
- Filled with gas. About 2 minutes driving down the road, Check Engine logo light goes on. Drive to mechanic.

- Replaced High Pressure Fuel Pump. And new hose. Car still taking a few extra turns to start and rough idle.

- Replaced spark plugs and coil. Same issue.

- Service Engine Soon light now came on.

Mechanic saying I need to replace all 6 fuel injectors which will cost me around $4000.

Questions:
1. Does anything know what went wrong?
2. Are these normal problems to have and in this order?
3. Is it possible I got a bad batch of fuel?
4. Is there anything else to do that doesn't involve changing all 6 fuel injectors?
5. Will fixing this issue actually fix the engine problems or will I probably continue to have more problems?

Any advice would be amazing. Trying to keep this car going as long as possible!

Thanks!

p.s. this is my first post so if I put it in the wrong place please let me know where this should go

[lookalikehuuh]

Oh man this "mechanic" is taking you for a ride.

Step 1 is for you to go get yourself a BMW specific scan tool. You can download software like INPA or ISTA then order an OBDII cable for your laptop and that will give you dealer level diagnostic abilities.

Another really good option is bimmergeeks protool which will work on your phone with a wireless dongle you can purchase from them. A third option would be a bmw specific scan tool like a foxwell. Fourth option would be a more "pro" level scan tool like an Autel tablet scanner.

Once you a proper scan tool you should be able to read BMW specific trouble codes that will allow us to help you diagnose your car.

You definitely should not go back to that mechanic since he is unloading the "parts canon" at your expense of course.

[swellengear]

I agree with lookalike. You need to get the fault codes read.

[JAM335i]

Ok I’ll get a scanner, any recommendations on which brand/model?
Amazon has a lot of them:

- FOXWELL NT710 $190
- FOXWELL NT510 Elite $255
- ANCEL BM700 $120
- FOXWELL NT301 $70

Does it matter which one?
Thanks!!

[lookalikehuuh]

Originally Posted by JAM335i

Ok I’ll get a scanner, any recommendations on which brand/model?
Amazon has a lot of them:

- FOXWELL NT710 $190
- FOXWELL NT510 Elite $255
- ANCEL BM700 $120
- FOXWELL NT301 $70

Does it matter which one?
Thanks!!

I personally don't have experience with any of these tools, I own the Autel MK808BT because of the wireless but that is twice the price of the tools listed here and it has a yearly subscription for tool updates.

After looking thru all the information on the page I would personally pick the Foxwell NT710 since it appears to be able to perform more functionality than the others. It should pay for itself pretty quickly if you own a BMW

[JAM335i]

Got the scanner, arrives tomorrow and I’ll update then. 1 more question:
Does fuel injector cleaner work? Worth trying?

[mainbearing]

The high pressure reading should have been read before the HPFP was replaced, along with the reading on the low pressure side.

If the injectors are failing, even the new HPFP should be able to manage spec high rail pressure I think. So check those two pressure readings too.

[JAM335i]

Ok so here’s the codes:

1. 29CF
2. P0303
3. A6CF
4. A6A4

I think 1 and 2 are the same thing and the only area of focus for now.

What do I do from here?
Thanks!!

[Sgop335]

it is spelling out Cylinder 3.
IF correct plugs / gap/ coil are being used then that turns attention to fuel injector 3.