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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 11-13-2015, 03:38 PM
drainr drainr is offline
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Location: connecticut
 
Join Date: Jun 2015
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Mein Auto: BMW 330Ci Convertible
2004 330 Ci convertible bucks at high speed

My 'new to me' 2004 330 Ci convertible with 40,000 miles has started bucking at high speed (65-80 mph). It just had a regular service (oil, air cleaner, etc.) at a non-BMW service. They suggested we bring to BMW service center, as possible BMW-proprietary software update needed for Oxygen sensor. Does this sound right? Any other thoughts what this could be?
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Old 11-13-2015, 05:49 PM
cvx5832 cvx5832 is offline
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Location: Walnut Creek, CA
 
Join Date: Jan 2009
Posts: 826
Mein Auto: 325Ci, 325Cic, C300
Quote:
Originally Posted by drainr View Post
My 'new to me' 2004 330 Ci convertible with 40,000 miles has started bucking at high speed (65-80 mph). It just had a regular service (oil, air cleaner, etc.) at a non-BMW service. They suggested we bring to BMW service center, as possible BMW-proprietary software update needed for Oxygen sensor. Does this sound right? Any other thoughts what this could be?
They will ream you a new one when the job is open like that.

Bucking at high speed for me was a soft-fail pump. Take it to a dealership and that $150 job will end up 5x more.

Get a code reader and diagnose it yourself. Or if you're just angry at money just mozy on in to your friendly neighborhood dealership.
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