i have been having alot of problems with my air mass sensor. Have had to replace 3 in the last 8 months.

Car is a 2007 TT with 18,500 KM on it. For the last 8 months, I have covered 8,000 KM on it of hard driving.

Keep getting check engine light warning. First was right side then left then right again. Was told that the TT is very sensitive to differential readings between the sensors. Diagnostic computer hooked up showed that it appears to be "sticking". Read that water entering the engine compartment can cause problems with it. Even after cleaning, it will cause the check engine light to come on after a short drive.

May car is parked outdoors and the temperature here is HOT .... About 34 degrees celcius. Humidity is also high. I live in Singapore.

Is this normal or is there a problem that causes the sensor to deteriorate so fast ? Appreciate any advise as it's driving me mad, not to mention, costing me funds that I could otherwise use to add go faster parts....

 

My '07 turbo has had problems with mass air sensors....I found is related to water getting into them coming in from vents in engine cover. Porsche allows water to pour onto the engine thru the slits. I cover those slits with a rubber mat when I wash it now and if going into work will cover those slits if rain is coming. I understand that water-on-engine-mess is corrected in the later models but not sure. Since covering those engine-covering openings, no more mass air sensor issues. Why Porsche allows water to pour into the engine compartment is a mystery to me. I am in florida and when it pours, belts squeak bad( and expensive mass air sensors go to crap. As long as engine is running there is no problem. Tech tell me the belt squeaks are called expected factory squeaks. Those have disappeared too with engine covered when parked in downpour.
If a rain catches me by chance, belt will squeak for weeks so I try to avoid the mistakes. a lot of crap for a +$120K vehicle.

 

Thanks...will try that. I suspect that it's water entering the engine thru the slats on the engine cover too.....

 

I doubt that's the problem. My car goes through the local wash 3 times/week, and I hand wash with a hose regularly. It might be the cause, but not the problem. Water alone shouldn't hurt anything on the engine. These cars get very wet in many places around the world, without requiring owners to raincoat them when the weather goes south.

 

Do you have an aftermarket air filter?

 

+1. I was thinking the same thing. BTW, Nice 8,000th post bbymu!

 

His post doesn't say he does. Stock is the assumption. If not, I refer to what I already said, "cause but not the problem."

 

I have had some MAF codes after a carwash- Is it possible to go MAFless and have a retune?

 

It is a possibility , sometimes an over oiled aftermarket air filter can souse this problem, especially if water is also present in the air box.

 

You take your car for washing 3x/week and you've never had a belt squeal? You're lucky! I'm like Johnww. I cover the engine with towels whenever I wash it. I was dumbfounded when I washed the car for the first time and noticed water sizzling off the warm engine. Who at Porsche designed a car that can't sit in the rain for a few hours without soaking the engine? My belts squeal after the rain too. The first CEL I got was for a bad MAF sensor AFTER a wash. They replaced it, then since I've been covering the engine during washes, no problem. As others pointed out, it could have been a coincidence and not related. But this whole water in the engine compartment thing just can't be good over time...

 

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[quote=MK23;3366834]You take your car for washing 3x/week and you've never had a belt squeal? You're lucky! I'm like Johnww. I cover the engine with towels whenever I wash it. I was dumbfounded when I washed the car for the first time and noticed water sizzling off the warm engine. Who at Porsche designed a car that can't sit in the rain for a few hours without soaking the engine? My belts squeal after the rain too. The first CEL I got was for a bad MAF sensor AFTER a wash. They replaced it, then since I've been covering the engine during washes, no problem. As others pointed out, it could have been a coincidence and not related. But this whole water in the engine compartment thing just can't be good over time...[/quote
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I may add since I cover the those fins when washing or parked at any length in a rain storm....no more crap-squeaking fan belts and too no more mass air sensor expense. I thought for a couple years that no protection was needed and then hell broke loose in one of Florida's worse downpours. Anyone that has escaped bothersome/costly water-on engine issues on these 997.1/.2 engines is lucky so far but those wretched rain gods never give up.

 

The rains can get pretty bad....think MONSOON.... A few month back, the main shopping belt, Orchard Road, shops were flooded....not to mention some condo car parks with exotic cars covered in water.

My car is stock but I am sure water gets into the air box and stuff....right now...I will try the cover the engine method and hope for the best.

 

Just get one of those thin rubber door mats and cut it to fit. If you put it on the engine lid at work, I keep a red card on my steering wheel warning me of the mat over the engine. One time I forgot the thing for a couple miles which I'm sure is not good for the engine. As long as the engine is running, never a problem.

 

The red card is a great idea. Worried that I would forget the mat.....