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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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  #1  
Old 02-24-2012, 02:25 PM
BimmerDan330X5 BimmerDan330X5 is offline
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Location: Chicago
 
Join Date: Dec 2011
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Mein Auto: X5 and 330
Code p16a7

Hello,

This is regarding a 2004 325ci. At slow speeds the car runs smoothly. Once you try to accelerate at higher speeds, the check engine light goes on, EML, and traction lights. It seems like there might be something clogged. The code that pops up is P16A7. If you turn the car off and back on, all lights go off. Has anybody had these problems before? I read somewhere else that somebody went through the same thing. They replaced all sensors and ended up replacing the engine wire harness. Anybody have any ideas? Thanks in advance.
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  #2  
Old 10-03-2015, 07:44 AM
boatingdobbins boatingdobbins is offline
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Location: Maryland
 
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Mein Auto: 525i
Have same pronlem

How was this fixed?
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  #3  
Old 10-13-2015, 12:11 PM
andy46 andy46 is offline
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Mein Auto: 2003 325i
Hey, hoping I could help. I had that exact code on a 2003 325i. It popped up for me twice in about 2 months under two different conditions, one being me accelerating slowly on the highway. The problem was a plugged up bank 2 catalytic converter.

After doing some research I found this page. I then tested my catalytic converters by hooking up a back pressure gauge.

I made my own back pressure gauge. I took a barb fitting that had same tread specifications as an oxygen sensor, wrapped some teflon tape around it to make sure it fits without leaks, attached a high temperature hose and a vacuum gauge.

I took out the primary (pre-cat) oxygen sensor, hooked the gauge up and idled the car, took a reading, then rev'd it up to about 4500 rpm and took a reading.

At idle bad cat in bank 2 showed somewhere between 0 and 2psi of back pressure (vacuum gauge wasn't accurate enough). At 4000 rpm it showed about 10psi of back pressure.
The good cat was 0 at idle, and maybe 2psi at 4000 rpm (again, vacuum gauge not super accurate). a

I replaced that bank 2 cat with another OEM one off a parts car, and everything was fixed.
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  #4  
Old 10-13-2015, 01:17 PM
forzam forzam is offline
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Mein Auto: 04 325Ci
^ Same. Changed cats, fixed problem.
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  #5  
Old 03-29-2016, 12:25 PM
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3seriesbmw 3seriesbmw is offline
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Mein Auto: 2003 325i
Did y'all have any other codes going on at the same time?
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  #6  
Old 03-29-2016, 01:30 PM
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Fast Bob Fast Bob is offline
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Quote:
Originally Posted by 3seriesbmw View Post
Did y'all have any other codes going on at the same time?
If you look at the posting history of this thread, you will see that it is four years old, and most of the original participants were only here for 1 or 2 posts, and have been long gone since then....
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  #7  
Old 03-29-2016, 03:08 PM
andy46 andy46 is offline
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Mein Auto: 2003 325i
Quote:
Originally Posted by 3seriesbmw View Post
Did y'all have any other codes going on at the same time?
Hey,

My car was slow to accelerate, felt sluggish and threw p0306 (cylinder 6 misfire) while accelerating at more than 50% throttle, between 4400 and 5000rpm. Sometimes it threw p0305 at the same time (cyl 5 misfire).

It threw p0306 pretty much consistently in that rpm range under hard acceleration, maybe not the first pull but second or third for sure. While I was at 4500+rpm plus I could hear some rattling with window open, because cyl 6 was misfiring.

However I was able to accelerate slowly at about 20% throttle and take it up to redline without any codes. The key was slow acceleration which didn't load up the engine as much as full throttle and the cat blockage wasnt screwing anything up.
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  #8  
Old 03-29-2016, 07:14 PM
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3seriesbmw 3seriesbmw is offline
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Did the CAT take care of all of that? The X3 is definitley sluggish and misfiring. I hope the CATs will take care of it..
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  #9  
Old 03-30-2016, 02:14 AM
andy46 andy46 is offline
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Originally Posted by 3seriesbmw View Post
Did the CAT take care of all of that? The X3 is definitley sluggish and misfiring. I hope the CATs will take care of it..
Yep, I replaced the 1 bad cat and everything got fixed. But I knew the cat was bad because I tested the back pressure on it and compared it to the good cat. So I knew it definitely was bad.
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  #10  
Old 03-30-2016, 01:05 PM
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3seriesbmw 3seriesbmw is offline
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Found a coil pack that was split in half. That took care of the misfires. Now I have the code P3242 and with the MAF sensor plugged in the car threw the P16A7 after 4K rpm. Once the MAF was unplugged the car didn't throw P16A7..
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Last edited by 3seriesbmw; 03-30-2016 at 03:01 PM.
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  #11  
Old 04-05-2016, 06:06 PM
Rockstar34 Rockstar34 is offline
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Do you have anymore cats to spare?
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