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Discussion Starter #1
My car at dealer, tells me the battery need to be replaced. Fine.

Charging me $197 for the battery and to reprogram my throttle body. I have no idea what this means. I don't care much but to know if I'm getting ripped off. He said the Battey costs $125, and $65 to do the program.

Thanks

[edit]:
Okay, here's the story: I got a battery at Advance, as suggested, and it was cheaper. Brought it to the dealer and he installed it and I got my car back Monday. Today, I finally got around to taking the old battery back to Advance to get my core deposit back. Before I did that tho, I had them test it to see if the dealer was lying about the battery being bad. Well, it turns out that the old battery tested good. So I'm pretty pissed. But, now my question is, is it possible for me to quickly switch the old battery back in w/out having to reprogram the throttle body? Or does the throttle body get wiped instantly?


-Brad
 

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Discussion Starter #3
Allright, cool. Called them and told them to wait. Can someone tell me where I can get a battery that will fit my 2001 B5.5 that has good prices? Pepboys? Walmart?
 

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My pornstar name came up "Jay the Snork."
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autozone or discount auto parts-got mine there (about 75 bucks) but my car was nondbw so i guess i got to skip the throttle body stuff.
 

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Well, that'll save me $50 anyway. Can someone explain to me about this whole "Throttle body" thing? I gotta say that when the dealer said it, it sounded hinkey, but I guess it is a real thing. What exactly do they do for me when they reprogram the throttle body?

-B
 

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methane said:
Well, that'll save me $50 anyway. Can someone explain to me about this whole "Throttle body" thing? I gotta say that when the dealer said it, it sounded hinkey, but I guess it is a real thing. What exactly do they do for me when they reprogram the throttle body?

-B
If you drive a face lift model, it uses drive by wire, which is a computer controlled throttle system. If it is not programmed correctly, your engine will run very rough. Disconnecting the battery will cause its memory to be wiped, so you will need to reprogram it. Anyone with a Vag Com can do this, so if you know anyone that has one, save yourself the money from the dealer. A dead battery wouldn't cause this, as you would still have minimal power, assumingly enough to maintain whatever memory it is that stores the settings for the throttle body.
 

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I unhooked my battery for like 3 hours doing an amp install and I haven't had any problems.. Also change the battery your self it should only take like 10 mins to do it.
 

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JT02460 said:
I unhooked my battery for like 3 hours doing an amp install and I haven't had any problems.. Also change the battery your self it should only take like 10 mins to do it.
Do you have a B5 or a B5.5?
 

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B5
 

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You have drive by cable, no throttle body adaptation is necessary as the body is linked to a cable. Our cars (B5.5) have computer controlled throttle body's.
 

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I changed my wife's B5 battery in my own garage. No throttle body reset required, even though I do have a VAG-COM.

Oh, the battery cost me about $70 from Kragen, with core exchanged.
 

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Discussion Starter #13
Okay, here's the story: I got a battery at Advance, as suggested, and it was cheaper. Brought it to the dealer and he installed it and I got my car back Monday. Today, I finally got around to taking the old battery back to Advance to get my core deposit back. Before I did that tho, I had them test it to see if the dealer was lying about the battery being bad. Well, it turns out that the old battery tested good. So I'm pretty pissed. But, now my question is, is it possible for me to quickly switch the old battery back in w/out having to reprogram the throttle body? Or does the throttle body get wiped instantly?


-Brad
 

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DIY. Probably no throttle body adaptation needed. I did not need one. I have a 'drive-by-wire' 2000 B5
 

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Discussion Starter #16
See, this is what I don't understand. I've been looking around the web, and replacing the battery doesn't seem like a big deal. And the owner's manual doesn't mention anything about it. I think my Stealer just wanted to rip me off. That would explain why he told me the battery was bad when it wasn't. I'm still going to get a third opinion on the battery from Pep Boys since right now it's 1-1 --for and against.
Another question I've got: I've read that on some cars (Touareg), turning the key to on and not doing anything for 30 second seems to reset things to their 'natural' state. Will this work for the Passat? Does this affect the throttlebody?
 

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I used to have a loose ground connection on my battery which meant sometimes it would need to be tightened before starting or all power would be lost. I didn't do any TB recalibration then as I didn't know.

Now when I disconnect the battery, even for a few seconds I reset the ECU and recalibrate the TB if I have my VAG with me. It may be a placebo effect but I'm sure I feel a smoother response after I take that first drive.

methane: If you wanted to know. Resetting the ECU takes a minute and only entails leaving the hood and driver's door open and turning the car on (not starting). You'll hear a whine from the TB as it goes back to a neutral position and the ECU should be reset after that. You shoud have first disconnected the battery for around 10 minutes though. Give your car a good drive after so that it can learn your driving habits again.

Anybody correct me if I was mistaken or if I forgot anything.
 

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Batteries are a crapshoot - some folks like to run them 'till they drop, and others like to replace them every few years.

I have a spare car to drive if one is out of commission. In southern California, batteries lead a fairly easy life. But, since failures seem to occur in the worst possible locations, at the worst possible times, I replace mine every 5 years or so.

I have seen a gizmo powered by a 9V battery that you plug into the cigarette lighter when disconnecting or replacing batteries. Its purpose is to keep the alarm codes / radio codes / etc. powered up and not lost when the car battery is removed.

I never had any problems though, so I never got one.
 

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Wait I am confused, to reset the ECU and take care of the throttle Body all you have to do is is what you were saying cm103? So I am buying an optima battery, all I have to do is that little process and I should be good to go? I do have a b5.5 by the way
 

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VWPassatGLX155 said:
You have drive by cable, no throttle body adaptation is necessary as the body is linked to a cable. Our cars (B5.5) have computer controlled throttle body's.
B5 '00 and '01 are also DBW. i know cuz the chip costs more since it's DBW :(
 
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