DTCs after Z1 turbos, AMS S2 HPFP, S2 AMS Injector Install

cjmitt60 · Jan 26, 2025

So I just installed these new parts listed above and I'm getting DTCs p0090 and p0193
I saw on the injector install to check pin fitment on the rail and it seems fine. I noticed the connection for the pigtail on the HPFP was extremely tight so I decided to sodder the connection so there couldn't possibly be a question about how well it fit.
the DTC flow chart says P0090 needs to be diagnosed first before diagnosising P0193. I noticed looking on the data chart that the fuel rail has about 3v at idle .
Anyone ever delt with this before? I feel like the extra fuel pressure would cause the rise in voltage thus causing the high circuit DTC. might just be a tuner thing but I don't feel like that's something that would have been overlooked on my basemap

LL_Q60 · Jan 26, 2025

Did u upgrade the high pressure fuel sensor located on the passenger side of the fuel rail.
Hear a lot of people having issues when upgrading the hpfp and not the fuel sensor.

cjmitt60 · Jan 26, 2025

I did not, tuner didn't tell me to grab it or else I would have 🫠
I sent him a short idle log and my DTCs. I thought abt that sensor but mine was working and never had a problem with it in the past so I didn't think to replace it.
I'll hear back from him tm and pick his brain and see what he says but I think ur on to something.

cjmitt60 · Apr 10, 2025

Just wanted to update this post it's been a bit The rail sensor did not fix it nor did replacing the connector. Ive checked grounds, and continuity in sensor group A and everything seems okay. Really throwing me for a loop

cjmitt60 · 2026-04-13T19:28:27-0400

So what ended up resolving P0643 was a engine harness. Hope this helps someone some time in the future

DTCs after Z1 turbos, AMS S2 HPFP, S2 AMS Injector Install

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