2015 50i is Throwing A lot of Codes

[x5m5]

So picked up a 2015 50i with 81k miles about a month and a half ago. Car has a race chip gts installed. Been driving it pretty hard and now am at 83k miles and just got a drivetrain malfunction with a bunch of codes. Cylinders 1-8 occasionally show up but the main ones that show up every time are

11A002 high pressure fuel plausibility, pressure too low

11B401 high pressure fuel on or after the release of injection too low pressure

11B501 high pressure fuel in or after the release of pressure too low

When I just have these the car still drives moderately ok but still does show up immediately after a reset.

Then occasionally these show up and the car is barely driveable

118501 Mixture Control 2 too lean: excessive deviation

11b701, 119F01, 11Cf31 which all releases to mixture not being right

I tried to revert the tune back to stock which was installed about 2 years ago by previous owner. Car drove great for first start then back to severe limo mode on the following start. Spark plugs were changed about 15-20k miles ago.

Tried doing a search but couldn't find where to start. My guess would be Maf first otherwise maybe fuel pump? Any input would be appreciated

[RED_Y_]

When you say "revert tune back to stock" did you completely removed it or you just changed the racechip settings? I would suggest taking RaceChip off completely and testing again. Sounds like your HPFP is dying and not providing enough fuel,might be a good idea to do injectors as well.

[x5m5]

Originally Posted by RED_Y_

When you say "revert tune back to stock" did you completely removed it or you just changed the racechip settings? I would suggest taking RaceChip off completely and testing again. Sounds like your HPFP is dying and not providing enough fuel,might be a good idea to do injectors as well.

I completely removed it. Waited 30 min per Racechip instructions for car to recognize it. And was automatically better. Then after shutdown and start reverted back to shaking/misfiring. Is there a way to test the HPFP? Laptop is down but I have Carly and schwaben/foxwell.

[turboawd]

I believe with ista you can check fuel pressure.

[RED_Y_]

ISTA would be your best bet, not that familiar with Carly and Foxwell functionality.

[DenBel]

Check pressure of both HPFPs with ISTA, one in dme the other in dme2, looks like one is failing

[JMAN1111]

My suggestions. Sparkplugs (get the m plugs),
8 fuel injectors, and you need a high pressure fuel pump. Might as well do an oil service while you're at it. You should be able to get the fuel injectors covered at the stealer though.

Also your ignition coils probably need to be swapped out if they haven't been done at your mileage.

[x5m5]

Took it to the shop and once he hooked it up was able to see voltage fluctuations from both high pressure fuel pumps. Replaced them both and the issue is gone. Is there a thread on how to get Ista? Going to need a new cable as well as download it on to my new laptop.

[RED_Y_]

Originally Posted by x5m5

Took it to the shop and once he hooked it up was able to see voltage fluctuations from both high pressure fuel pumps. Replaced them both and the issue is gone. Is there a thread on how to get Ista? Going to need a new cable as well as download it on to my new laptop.

Download it, just search here or google.

[ponytuning]

You can also get the download link for the latest version from ebay sellers, can be had for as low as $9