2004 M45 TPS problem

[myother45isalesbaer]

My 2004 M45 started to stop reading one tire pressure correctly and keeps giving me a flat tire warning.

I have rotated tires, changed tires, replaced tires and it always reset itself without any problems. It seems one sensor is bad.

Any ideas??

Thanks.

[Wretched]

Wrong section man, but it sounds like your gonna need a new sensor. You might try getting the car into reset/learn mode, but I'm not sure how you'd do that w/o the special tool. There is a small one wire plug next to your obd II port that needs to grounded 5-6 w/in 4-5 seconds after the key is turned to the 'on' position...but like I said, w/o the tool made to do this, I'm not sure what damage just grounding the wire could do. Just take it to a reputable tire shop.

[Wretched]

Oh, btw, the sensor you're thinking of is the tpms, not the tps (throttle pos. sensor). Just to avoid any future confusion.

[myother45isalesbaer]

thanks. off to the dealer i go.

[Wretched]

The dealer will rape you on something like this...which is why I said take it to a tire shop. But it's your money, man.

[myother45isalesbaer]

whats the cost of being raped by a dealer in your opinion. i have found the part for between $50 to $100 depending on where I get it.

I was thinking the whole deal to replace one sensor should be about $150-$200.

I was wondering how do they determine which sensor is bad? Must need a special tool for that. I doubt the locals in my area have that tool. or is there a simple way to determine which sensor has gone bad??? I thought this might be a do it yourself job......but soon realized there is no way I can dismount and mount a tire.

By the way.....mine have always reset themselves without any dealer intervention. So I am lost as to why a dealer has to do anything except find the bad one and replace it. I see other posts that state otherwise. If I had a tire changer I can buy a new OEM sensor on ebay for $50.

Thanks for your advice again. I will let you know what the final outcome is as soon as I get it fixed.