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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 08-16-2006, 10:12 PM
5erBlCkBiMm's Avatar
5erBlCkBiMm 5erBlCkBiMm is offline
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Unhappy Scanned CODEs!What do u think?

Check engine light came on, and this is what i got after i use my peake code reader...

1. Electric thermostat control final stage
( i think thermostat)

2. PreCat o2 sensor disconection, CYL #4-6
(o2 sensor right! left or right?i know theres 2)

Any advice guyz before i start replacing o2 sensors.
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  #2  
Old 08-17-2006, 12:13 AM
Jon@TheMshop Jon@TheMshop is offline
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Quote:
Originally Posted by 5erBlCkBiMm View Post
Check engine light came on, and this is what i got after i use my peake code reader...

1. Electric thermostat control final stage
( i think thermostat)

2. PreCat o2 sensor disconection, CYL #4-6
(o2 sensor right! left or right?i know theres 2)

Any advice guyz before i start replacing o2 sensors.
Yeah.. bad thermostat.. replace it.

The PreCat O2 sensor Cyl 4-6 is the sensor towards the rear of the vehicle.
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  #3  
Old 08-17-2006, 05:16 AM
BMW1983 BMW1983 is offline
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I think pre-cat means before the cat, as in the o2 sensor near the front
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Old 08-17-2006, 07:49 AM
Jon@TheMshop Jon@TheMshop is offline
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Quote:
Originally Posted by BMW1983 View Post
I think pre-cat means before the cat, as in the o2 sensor near the front
OK let me correct what I meant to say..

There are 4 o2 sensors. 2 at the top of the exhaust manifolds and 2 after the cat which is under the engine bay/after into the cats. This is how it is on the M52TU engines.

If you have a precat O2 sensor fault for cylinder 4-6, then it is o2 sensor on top of the manifold that is towards the rear of the engine or vehicle.
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  #5  
Old 08-17-2006, 04:18 PM
ptabaco ptabaco is offline
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On 6 cyl engines, cyl #1-3 exhaust manifold goes down and to the left (driver's side) of the car and #4-6 go down and to the right (passenger's side).
And there're two sets or 02 sensors, 2 before the cat and 2 after.
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  #6  
Old 08-18-2006, 07:51 AM
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5erBlCkBiMm 5erBlCkBiMm is offline
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Hey thankz....
first question what brand of thermostat have you guys used in the past
WAHLER or BEHR i think both are oem according the the sites i've been to...which one would you recommed.!/?

You think o2 sensor would be a good DIY?Or should i let the pro handle it...
I know thermostat im doing that myself, but if its in the same level of work for an o2 sensor might as well order it and do it myself...Never done o2 sensor on bmw how hard could it be to unplug and plug, or am i wrong?
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Last edited by 5erBlCkBiMm; 08-18-2006 at 08:04 AM.
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Old 08-18-2006, 04:42 PM
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It is not difficult. check here... it is for a M62, dunno if it is too different on a 528...
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