Balbir

I have a 2001 911 turbo with 68,000 km. During a hard acceleration, PSM, ABS and Brake Fluid lights come on. When I restart the engine, these lights turn off but the PSM remains deactivated.

I have read lots of forums and none of them really address my situation. Some of the forums say that battery fluid shifts during a hard acceleration and can cause these lights to come on. I have changed the battery and the lights still come on.

These lights started to come on after I changed the drive belt. In order the changed the drive belt, I had to take of the air box and MAF. Some of the forums suggest that MAF sensor could be faulty. I was very careful with the MAF sensor and I didn’t drop it when I changed the drive belt. I believe if the MAF sensor is faulty, then I should get a fault code.

I don’t know if the brake fluid level senor is faulty. I don’t know how to test it. However, when I did disconnect the brake fluid sensor, the PSM and brake fluid lights came on. Then, I reconnected, both lights turned off.

If anyone has a suggestion, please reply to this post. I would greatly appreciate it!

rmc1148

You don't always get a light when the MAF is going bad= it usually will progress to the point that you do. How old/miles is your MAF?

Balbir

I think the MAF is original. Im the second owner. I don't know if it has been changed. The car is 2001 with 68km. can I test the MAF without the porsche scan tool? If the MAF is faulty, why would it throw brake fluid light?

rmc1148

They can be checked with a multimeter and a MAF can cause all kinds of weird things. It could be a multitude of things but with the hard acceleration causing it I would guess MAF.

robertgalka

Mine did the same thing after a spark plug change. I didn't pop on the the intake hoses properly and had a major boost leak.

rmc1148

That could definitely be it but I would believe he would see loss of boost on gauge= did you check boost number.

Balbir

Does any have instructions how to check the MAF sensor with multimeter?

Balbir

I didn't check the boost number. I'll check.

Balbir

Robertgalka..just to confirm, when you had the same problem ..did your brake fluid light came on too?

robertgalka

It happened quite a while ago so I'm not 100% sure. I do remember that I had lots of strange brake warning lights. My hoses weren't popped on properly.

Balbir

Today I did clean the MAF sensor and no change. Today, the lights came on under a moderate acceleration on a bend when I made the rear wheels lose traction little bit. I then restarted the car and lights went off. However, the PSM hasn't worked ever since the lights started to coming on. Even when I restart the car and the lights turn off, I can spin the rear wheels, which means the PSM doesn't work.
Also, I did check the boost and it seems like working.

"02996ttx50

being able to spin the rear wheels doesn't mean your psm isn't functioning.