[Biturbos4] Throttle position sensor problem

Richard van der Hoff quattro at rvanderhoff.org.uk
Sun Oct 26 10:24:43 PDT 2008


j y wrote:
> Is your ECU stock?

Yes, it is.


> ------------------------------------------------------------------------
> *From:* Richard van der Hoff <quattro at rvanderhoff.org.uk>
> *To:* Quattro List <quattro at audifans.com>; biturbos4 at www.audifans.com
> *Sent:* Sunday, October 26, 2008 11:01:23 AM
> *Subject:* [Biturbos4] Throttle position sensor problem
> Hi guys,
> I've been having a bit of trouble with my 1999 S4 biturbo, and was
> wondering if anyone had any experience with similar problems.
> The symptoms started with an intermittent engine fault light. I plugged
> in the VAG-COM and the problem seemed to be
> "17581 - Angle Sensor 2 for Throttle Actuator (G188) Signal too High
>             P1173 - 35-10 -  -  - Intermittent".
> Now, I've monitored the offending sensor in VAG-COM, and it appears to
> move nicely up and down with the gas pedal. I've also checked for loose
> or corroded connections between the sensor and the ECU, and taken apart
> the sensor and checked for damage inside. All came up blank.
> So I put it all back together, thinking "it'll either fix itself, or
> become worse until it's obvious what the problem is".
> So yesterday it got worse (on the way to a friend's wedding, of
> course...) - and I lost pretty much all power; basically the engine shut
> itself down to a fast idle. Fortunately after a restart it ran fine again.
> I limped it back home today - the problem seems to be getting more
> regular, and have pulled the codes again. I now have, in addition to the
> original fault:
> 17950 - Angle Sensor 1 for Throttle Actuator (G187): Implausible Signal
>             P1542 - 35-10 -  -  - Intermittent
> 17965 - Charge Pressure Control: Positive Deviation
>             P1557 - 35-00 -  -
> So presumably both throttle sensors are out of spec at once and the
> engine is shutting itself down to a safe state. I'm hoping P1557 is a
> symptom of the other problems, otherwise it looks like I have a boost
> leak to add to my woes.
> In short, does anyone have any experience with throttle-sensor problems,
> any joy in fixing it, and if (as I suspect) I need a new throttle
> sensor, is it possible to obtain one without the entire throttle body?
> Thanks
> Richard
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