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Discussion Starter #1
I took my 02 beast to an independent to replace the guibo and center bearing on the driveshaft. When i got the car back, the SES light was on, and within 30 seconds of warming up, the car went into limp mode. I took it back, and was told i had a bad catalytic converter. The mechanic said the converter was going bad, and the act of removing the exhaust to replace the parts must have resulted in the internal pieces in the converter breaking and blocking the opening. Not believing him, I took my car to the dealer, and was told by my very reliable service manager that the converter was fine, but all 4 O2 sensors were showing an open circuit. In other words, they needed replacing. The sensors barely have 4,000 miles on them, and there is no way they can all go bad at the same time during a driveshaft removal. Does anyone know what could have gone wrong? I would hate to replace the sensors, and later find out it was something else. Can all 4 sensors go at the same time? Something dosent sound right.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:eek:ffice:eek:ffice" /><o:p></o:p>
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Thanks

Zamir
 

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Possibly when the shop removed your exhaust, they damaged your sensors in the process.
 

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Possibly when the shop removed your exhaust, they damaged your sensors in the process.
+1. Or, they were pulled out of their connectors where they connect up to the car on the electrical side. If they simply forgot to unplug them, it could have pulled on the connectors when they dropped the exhaust. Might be repairable when you look and get under the car (or put the car on a lift).
Regards,
Jerry
 

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I recently got my car back from the shop for doing a clutch/fly job and the ses light was on. I figure it was the o2 sensors since iIhave 105k. Well i order new pre-cat sensors and replaced them yesterday. I replaced one side which went ok but when I got to the other side I notice that the pre and post-cat sensors were plugged together and that the wires coming from the computer where plugged together. After getting the wires figured out I put the sensor on. I drove the car after the job was done and the ses light was GONE. :M5launch:
 

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More than likely, unless damaged, all four sensors would not go bad at the same time. The sensors could have been left disconnected, and this would cause the MIL light to come on. If they did the guibo and then the light comes on and they worked in that area, and now they are wanting to charge you for something they possibly did. It sounds fishy to me. It could be that they damaged the sensors and are trying to get you to pay for their mistake.

Darka.... I have never seen it were you can plug to male ends or female ends together. you have to have one of each to work.
 

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as darka stated i have seen that done many of times. it actually happened to me ouichwhen i did my cluch very easy to do ck your connection look at them physicly and follow the wires to the harnest and you will see that yuor o2 sensers are connected to each other and not to the car very easy fix you can do it on your back and a small 10 mm socket you dont evenhave to jack it up
 

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Discussion Starter #7
Thanks guys for all your responses. I will take the car back to the shop and have them put it on a lift. I want to check out the connections myself. They could have plugged them into the wrong conectors, but i find it hard to believe that they could damage all 4. I will update later today.

Thanks again

Zamir
 

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Discussion Starter #8
Installing Magnaflows 14816

I also bought a set of maganflow 14816's from a board member who never used them, so will try to get them installed today. Still unsure if I should keep the resonators.
 

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You can get a read on your cats by checking if they stink or rattle when you tap them. Either would be a better indication of failure.
 

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Discussion Starter #10
Well as usual, you guys were right. I picked my car up from Advantage BMW downtown where i was having it diagnosed. They assured me that they had checked the wiring, and the sensors were plugged in the correct spot, and yes, i would still need to replace all 4 sensors. I paid the $125 diagnostic fee and took the car back to the guy who did my driveshaft. He was busy installing a supercharger in an M3, but finally got my car on the rack. After 60 seconds, i heard an "oh f*#k, I crossed your wires on the right side. Sorry man. Hey, you want to install a supercharger". 2 minutes later i was test driving the beast, and the problem is fixed. One of the wires were crossed. Not sure how the dealer didnt see that, and why they said all 4 sensors were shot!! Anyway, I am still going to try and get my maganaflows installed today.

Thanks guys for all the feedback. You saved me a lot of money.

Zamir
 

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:7: "oh f**k,....sorry man. Hey wanna install a supercharger?" I am glad you are all sorted..freaking stealers.

Vic
 

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Discussion Starter #12
still cant believe they wanted to change all four O2 sensors when the only problem was a crossed wire!! They must really screw people who dont know much about fixing cars.
 

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Hey, Zamir

Could you PM me the indy you're using in the Houston area? I need some where to go in the future if/when I have issues with my gal for second oppinions. Thanks in advance.

Vic
 

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Discussion Starter #14
the best guy i have found is Bavarian Machine Specialities at 3117 D'Amico. 713-524-8365. He is a perfectionist but is expensive. I did about $7 grand worth of work with him that was only supposed to cost $4 grand (he keeps finding things and trys to fix every little potential problem. He wanted me to replace my rod bearings becaue of high millage, even though there is no indication of any issues with them. He does work on a lot of M-5's and builds race engines. I stopped going there and now use Bemer Motorcars on 9201 Richmond 713-266-2690. I used M-Power at 832-868-4954 most recently for my struts, clutch, O2 sensors and to replace my guibo and differencial bearing at 8620 Richmond. I wouldnt recomend them since they are sloppy and are more familar with M-3's than M-5's. They often leave things loose, and dont go that extra step, but are cheap. With over 130K on my car, cheap works better for me. They eventually gets the job done, but you may have to make a couple of trips. Hope that helps. Who do you use?

Zamir
 

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Discussion Starter #16
thanks Doug. I didnt want to say that, but there is no way the dealer didnt know the wires were crossed. I feel bad for the many that trust and get ripped off by them.

Z
 

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the best guy i have found is Bavarian Machine Specialities at 3117 D'Amico. 713-524-8365. He is a perfectionist but is expensive. I did about $7 grand worth of work with him that was only supposed to cost $4 grand (he keeps finding things and trys to fix every little potential problem. He wanted me to replace my rod bearings becaue of high millage, even though there is no indication of any issues with them. He does work on a lot of M-5's and builds race engines. I stopped going there and now use Bemer Motorcars on 9201 Richmond 713-266-2690. I used M-Power at 832-868-4954 most recently for my struts, clutch, O2 sensors and to replace my guibo and differencial bearing at 8620 Richmond. I wouldnt recomend them since they are sloppy and are more familar with M-3's than M-5's. They often leave things loose, and dont go that extra step, but are cheap. With over 130K on my car, cheap works better for me. They eventually gets the job done, but you may have to make a couple of trips. Hope that helps. Who do you use?

Zamir
Sorry for the late reply Zamir. I was actually looking out for your PM. Thanks for the leads above. I have been fortunate not to need much work done to my car apart from the regular fluid changes, brake pads and a battery. I am still under warranty as well. Just looking for a good place to go in the future when warranty runs out and for second opinions when I go to the stealer. I heard of a Sports Car Specialists/Repair on SW freeway between West Park and Fountain View next door to Nexes. A member on this board pointed me that way and mentioned Troy, the lead mechanic who also owns an E39 M5. The funny thing is I ran into Troy who lives out where I live (Katy area) about 2 months ago at a stop-light pointing out that my Magnaflows sound awesome. Talk about small world.

Anyway, they work on lot of BMWs/M5s and Troy has been doing it for 15yrs and owns an M5 himself. They also seem to be very reasonable about 65-70.00/hr on labor I think. Sorry I don't have his card handy, but I'll post back if you need to contact the shop. There is another European Car Repair on Mason and Highland Knolls(my neighborhood) that work exclusively on Porches, Mercs, BMWs, and Audis. The lead mechanic use to work at BMW dealer for about 10-12years. I believe he is a certified BMW tech. These guys charge about 95.00/hr. I took my car to them and they wanted to charge me $700.00 for a brake job excluding rotors and a brake fluid flush. Needless to say, I didn't go back there. Ended up getting the pads from Dave Z..can't spell his last name..($150.00)..and had a friend install them including a brake flush that I helped with for a six pack of Hieneken. I'll get the rotors from Dave when it's time.

I can also get the number for the above shop if you need it. Like I said, I have used neither, but when the time comes, I'll go the Troy at Sports Car Repair/Specialist route.

:cheers:

Vic
 

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Discussion Starter #18
Thanks Troy for the detailed response.
 

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Discussion Starter #19
Sorry, I meant thanks Vic, not Troy!!!
 

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;)..You're welcome.

Vic
 
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