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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 03-03-2010, 12:35 PM   #1
nhbmwguy
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Join Date: Mar 2010
Location: NH
Posts: 14
My Ride: 2002 325xi C/P/S
Pre-cat Oxygen Sensor DIY (lots o pix) version 2



Thank you to the author r0x of the thread Pre-cat Oxygen Sensor DIY (lots o pix). Please use that as a reference.

This post has more pictures to give you a better view of the O2 pre-cat sensor locations.

I have a 2002 BMW 325xi with 248k+ on it. It failed emissions and the state of NH gave me 60 days to fix the issue.

There were 3 error codes:

1. P0491 Secondary Air Injection System (Bank 2)
2. P0492 Secondary Air Injection System (Bank 1)(6)
3. P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

Here are some photos of my adventure replacing my O2 sensors and spark plugs. I had not replaced the plugs since ~120k. The plugs and the O2 sensor were completely fried.

Parts list:

Bosch Platinum +4 Spark Plugs $49.99
2 Bosch Premium Upstream O2 Sensors $79.99 each (Part# 13477)
Purolator Air Filter $14.99
O2 sensor removal tool $5.99

My gas mileage went from 18.1 to 24.5 instantly. (Please note I took out my spare tire and tools... given the price of gas, and the fact I have AAA, who needs the additional weight.)

Back 2 years ago I was getting 26-27 mpg on occasion with highway driving 50-60 minutes one way.

Please note, I did not take apart the cabin filter section. You will see some photos with the O2 sensor tool fitting in for removal/replacement. Same goes for the rear 2 spark plugs.

I also replaced still need to replace the Front/Bank 1 (Cylinders #1,2,3) O2 sensor this week. (No one had it in stock)

I also noticed the hoses going into the vacuum pump are brittle and broken. I am replacing them next...

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Last edited by nhbmwguy; 03-04-2010 at 08:42 PM.
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Old 03-20-2010, 10:58 AM   #2
phamine
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Thanks for the post.
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Old 05-03-2010, 05:39 PM   #3
BillyJoelR
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Join Date: Dec 2006
Location: Chestermere, Alberta, Canada
Posts: 1,841
My Ride: Velvy B.
OP...
I'm curious if the error regarding the PreCat Oxygen Sensor Heater Circuit disappeared after replacing the Oxygen sensor?
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Old 05-03-2010, 09:52 PM   #4
Intense
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Join Date: Aug 2006
Location: Barcelona (Spain)
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My Ride: 330 Ci Cabrio
Quote:
Originally Posted by BillyJoelR View Post
OP...
I'm curious if the error regarding the PreCat Oxygen Sensor Heater Circuit disappeared after replacing the Oxygen sensor?
I had the same error and it dissappeared when changing sensors.
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Old 01-31-2011, 12:51 AM   #5
blinkerfluid
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Join Date: Jan 2011
Location: Northern Nevada
Posts: 42
My Ride: 2002 325xi
Thanks rOx and hnbmwguy for all the good info. I wanted to ask if you had any drivability symptoms from the bad O2 sensors. Specifically, was your throttle response normal? The main symptom I have: when I am at full throttle and quickly lift my foot off the acc pedal, the engine continues at full power for more than a second. Did you have any issues like this? Thanks.
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