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Has anyone ever heard of this happening?

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I have searched through the forum's and only found very limited information about this.

The Car below is a 1998 Boxster RWD Midmount 2.5 Convertable 5-speed

I have this car down here because my mother has my car. Ever since I have started driving the car, a series of thing have started happening. The first happened just last week, where the Ebrake wouldn't come on, I tried to figure out what the problem was thinking it was the plunger sensor on the Ebrake inside the console. I then filled the car up today with "racetrack" brand 93 fuel earlier today, and about halfway to my destination *about 30 more miles till i am at my destination* I have a check engnine light appear. Being the car guy that I am, I pull the car over and goto the nearest autozone to get a check on the ECU. The codes that were pulled were:


Manfacurer Contrl.

Auxiliary Inputs

Auxiliary Outputs


Manfacurer Contrl.

Fuel Air Metering

I then spoke with the local Porsche stealership in my home town, and the guy said that the P1123 was and could be the timing, as the car has 95k on it. He then went on to say that the P1691 could be a potential problem with the cluster coming up. I became a bit afraid at the cost that I started getting told by the stealership. So I'm just wondering is it time to just sell the car / trade it, or would it be even remotely feasible as we have already dumped almost 4k into this car in the past 2 months. Does any of this sound like a few major problems. Thanks for replying.

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P1691 - Check Engine Malfunction Indication light (MIL) - Open Circuit

That fault says you have a open wire in the CEL circuit somewhere between the DME and instrument cluster. Has the cluster been out recently? Could be just a loose connector.

P1123 - Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Lean Threshold

I don't see what your dealer is talking about with timing. This fault means that the DME can not lean the mixture enough (you are running too rich) on one bank. If this occurred right after getting gas I would reseat the gas cap - clear the fault and see if it occurs again.

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