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      07-10-2018, 04:47 AM   #1
kenzoo
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n53 faultcodes 2AAF and 2AAE

Hey guys!

The car is a 523 Lci 2007 190PS with n53 engine , 215000 km .

If i'm not wrong the n53 Engine is similar to the n54, but without the turbos, it's direct injected.
I'm getting a message on iDrive telling me Fuel Pump Fault.

2AAF - Fuel pump; plausibility- Intermittent .
2AAE - Fuel pump - Intermittent

But the car runs great.
I have even monitored the fuel pressure, Low pressure pump is Feeding the HPFP with ~5000hPa , and the rail pressure is ~200,000hPa .

Back in 2016 the previous owner got the HPFP replaced and NOX sensor and coils.

Last edited by kenzoo; 07-23-2018 at 06:17 AM.. Reason: more detailed
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      07-27-2018, 05:05 PM   #2
kenzoo
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cmon guys

car still runs good, with 2 faultcodes present
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      03-09-2019, 03:45 AM   #3
unohtumaton
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Hi kenzoo,

nice to hear, you have the same vehicle as me, 175000 km. Back in 2012 the previous owner got the HPFP replaced and coils, NOx sensor is original.
Unfortunately I have a problem now with cold idle run. After start runs engine at first fine 1200 reduces then to 700, but after in a few sec it makes a spice down and start to run unevently and MIL light comes on. After new start runs fine.
Some times a fault message from NOx sensor (INPA).
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