I was driving back from school for winter break today which is about a 250 mile trip or so and on 3 occasions I went into what I believe was limp mode. I had little to no boost and none over 5psi. I was driving on the interstate doing 75-85mph. After having no boost for about 5mins it would all the sudden come back and run perfectly normal after that. I'll go ahead and scan for codes in the morning but any ideas?

 

Notice anything out of the ordinary before, during, or after the limp? Kinda tough to diagnose w/o codes =/

 

Holy crap you're in herndon? thats right down the street from me! lol.

 

Ok so I got a chance to get the codes and this is what I found:


-------------------------------------------------------------------------------
Address 01: Engine
Controller: 4B0 906 018 CH
Component: 1.8L R4/5VT G 0001
Coding: 16751
Shop #: WSC 65728
4 Faults Found:
17887 - Brake Boost Vacuum System: Mechanical Failure
P1479 - 35-10 - - - Intermittent
16795 - Secondary Air Injection System: Incorrect Flow Detected
P0411 - 35-00 - -
17963 - Charge Pressure: Maximum Limit Exceeded
P1555 - 35-10 - - - Intermittent
17522 - Oxygen (Lambda) Sensor: B1 S2: Internal Resistance too High
P1114 - 35-10 - - - Intermittent
Readiness: 0000 1000

-------------------------------------------------------------------------------
Address 03: ABS Brakes
Controller: 8D0 907 389 E
Component: ABS/ESP allrad D56
Coding: 04277
Shop #: WSC 06435
1 Fault Found:
01203 - Electrical Connection between ABS and Instrument Cluster
03-10 - No Signal - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments
Controller: 8D0 920 980 Q
Component: B5-KOMBIINSTR. VDO D12
Coding: 02244
Shop #: WSC 06435
1 Fault Found:
00849 - S-contact at Ignition/Starter Switch (D)
31-10 - Open or Short to Ground - Intermittent

-------------------------------------------------------------------------------
Address 35: Centr. Locks
Controller: 8L0 862 257 N
Component: CV-Pump, Alarm, RC D16
Coding: 16232
Shop #: WSC 06435
2 Faults Found:
01367 - Central Locking Pump Run Time Exceeded (Likely Leak)
35-00 - -
00955 - Key 1
09-00 - Adaptation Limit Surpassed

 

17963 - Charge Pressure: Maximum Limit Exceeded

thats the code that poped out at me. thats an overboost for whatever reason.

also 17887 - Brake Boost Vacuum System: Mechanical Failure
might want to get that checked out.

 

Ok so it happened to me again tonight just leaving a stop light. I didnt even take off that hard, it just spiked around 20psi and then went into limp, came back less than 30secs later.

I've currently got it setup so that I have a mbc in a loop with the n75. Think I should remove the mbc and just use the n75 alone? I feel like I have better holding psi with the mbc though.