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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 11-30-2010, 04:44 PM
shupe03a4 shupe03a4 is offline
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Location: San jose,CA
 
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Mein Auto: 99 Audi A4TQMS
Codes 279D, 279B, 27b8, Wiring harness? Please Help

Hello all,
I am trying to help my friend with this car he bought recently, 02 E65. Check engine light has returned. First time had smae codes, We started by replacing the thermostat and the cleard the codes and after about a week the CEL came back, same codes

279D - Output stage, Electric fan
279B - Thermostat Jammed, (coolant below regulating temp)
27B8 - Differential Pressure sensor intake manifold, Plausability

So we have done t-stat already with genuine parts, and I found a bullitin online about replacing the engine wiring harness if the same code comes back.

Has anyone replaced the wiring harness to resolve this issue?

BTW, Fan is getting power, Signal- not sure O-scope crapped out...

Hoping that someone else has seen/repaired this before, Really don't want to tell him to go buy a harness if it's not needed.

Thanks for your time and help.
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  #2  
Old 11-30-2010, 07:40 PM
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wilson009 wilson009 is offline
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Location: Buckeye Country (Cincy)
 
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Posts: 440
Mein Auto: 2002 745i 116k
I would try using an ohmmeter before you start replacing harnesses. Those things are expensive and this isn't the kind of car you can just throw parts at in hopes of fixing it. I can't imagine a wiring harness would go bad that often.

I haven't experienced any of that but good luck.
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Black 2002 BMW E65 / 745i 114K
My DIY's - New alternator, battery, CCVs, idler/tensioner pulleys belts, NGK Iridium spark plugs, , sway bar bushings, Front rear brakes, Valve Block, Head Gasket, Exhaust Gasket, Upper and lower Timing Gaskets, Valve Covers, exhaust valves, Timing Chain slide rails, Fuel Injector o-rings, pulled radiator, Intake Manifold Gaskets, water pump, Coolant Pipe/weep hole, oil pan gasket, vacuum pump, fan shroud, Vanos solenoid o-rings, and timed it with a timing kit.
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Old 11-30-2010, 08:18 PM
dko888 dko888 is offline
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Location: Los Angeles, CA
 
Join Date: May 2007
Posts: 14
Mein Auto: 2004 BMW 745Li, 325i
Quote:
Originally Posted by wilson009 View Post
I would try using an ohmmeter before you start replacing harnesses. Those things are expensive and this isn't the kind of car you can just throw parts at in hopes of fixing it. I can't imagine a wiring harness would go bad that often.

I haven't experienced any of that but good luck.
Check your alternator first, make sure you have a good alternator, had horrible experience spent money replaced parts according to the CEL error codes on my 745 and 325 but ended up all due to weak/faulty alternator, or alternator voltage regulator. Good luck.
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