# Hmm, Codes. A little help? B6 A4 1.8T
**URL:** https://forums.speedlife.net/t/hmm-codes-a-little-help-b6-a4-1-8t/158940
**Category:** NYSpeed Automotive
**Created:** [August 10, 2010, 1:29pm UTC](https://forums.speedlife.net/t/hmm-codes-a-little-help-b6-a4-1-8t/158940 "2010-08-10T13:29:08Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Daddie](https://forums.speedlife.net/u/Daddie)
#### Post date: [August 10, 2010, 1:29pm UTC](https://forums.speedlife.net/t/hmm-codes-a-little-help-b6-a4-1-8t/158940/1 "2010-08-10T13:29:08Z")
Car won’t stay on. Start - high idle (1400 RPM). 5 seconds, and then it dies. No throttle response. Thinking, needs vacuum.
There’s no N75 valve, it’s on a MBC and the software is supposedly tuned to not care about it.
Ideas? Besides : I think you have a bad ground.
```
Address 01: Engine Labels: 06B-909-518-AMB.lbl
```
Control Module Part Number: 8E0 909 518 AK HW: 8E0 909 01ÿ ÿÿ
Component and/or Version: 1.8L R4/5VT G 0003
Software Coding: 0016711
Work Shop Code: WSC 00000 000 393216
VCID: 79F21DBF49B1
4 Faults Found:
17955 - Boost Pressure Regulation Valve (N75): Short to Ground
P1547 - 002 - Lower Limit Exceeded - MIL ON
17525 - Oxygen (Lambda) Sensor Heating Circuit: B1 S2: Short to Ground
P1117 - 002 - Lower Limit Exceeded - MIL ON
17881 - EVAP Leak Detection Pump: Open Circuit
P1473 - 004 - No Signal/Communication - MIL ON
17523 - Oxygen (Lambda) Sensor Heating: B1 S1: Short to Ground
P1115 - 002 - Lower Limit Exceeded
---
### Author:  [@Kramer](https://forums.speedlife.net/u/Kramer)
#### Post date: [August 10, 2010, 1:47pm UTC](https://forums.speedlife.net/t/hmm-codes-a-little-help-b6-a4-1-8t/158940/2 "2010-08-10T13:47:42Z")
lol ohhh jesus
---
### Author:  [@Daddie](https://forums.speedlife.net/u/Daddie)
#### Post date: [August 12, 2010, 1:45pm UTC](https://forums.speedlife.net/t/hmm-codes-a-little-help-b6-a4-1-8t/158940/3 "2010-08-12T13:45:46Z")
Really? Nothing?
I gotta figure out wtf is up with these O2 sensors. I guess the heating element died.
---
### Author:  [@Viper966](https://forums.speedlife.net/u/Viper966)
#### Post date: [August 12, 2010, 2:54pm UTC](https://forums.speedlife.net/t/hmm-codes-a-little-help-b6-a4-1-8t/158940/4 "2010-08-12T14:54:38Z")
my m3 had something like this…
the 02 sensor wire melted and shorted itslef out… it caused the ECU to throw the car into limp mode…
I got under and the 02 sensor wire had completely melted and was just bare copper for 6-8 inches near my headers… i guess i had routed them wrong during the header install…
I replaced with new OEM headers and zipp tied them to the clip… reset the car adn Voila!!!
i think your car is in a limp mode
---
### Author:  [@burnt\_toast](https://forums.speedlife.net/u/burnt_toast)
#### Post date: [August 12, 2010, 4:11pm UTC](https://forums.speedlife.net/t/hmm-codes-a-little-help-b6-a4-1-8t/158940/5 "2010-08-12T16:11:36Z")
I would definitely check the wires for the O2 sensors, because in all honesty, it looks like a bad ground. 🙂