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sprinkles08
sprinkles08, ASE Certified Technician
Category: VW
Satisfied Customers: 21591
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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I have a 2006 passat VIN# WVWEK73C96P061393 with code P0171,

Customer Question

Hi I have a 2006 passat VIN# ***** with code P0171, my parking breake and all my analog gauges on my instrument cluster doesn't work
Submitted: 1 year ago.
Category: VW
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to Justanswer!

The emergency brake and gauges would be separate issues from the P0171. P0171 sets when the engine is running excessively lean. The engine controller has the ability to take away or add fuel as necessary to bring the engine back to the optimal air/fuel ratio. When it is adding fuel to the extent of it's capabilities and the engine is still running lean then this code will set.

There are quite a few things that can set this and it will take some testing to know exactly what is going on. Checking fuel pressure would be recommended, a scan tool to monitor data may be needed. It could be a vacuum leak, low fuel pressure, fuel quality, an inaccurate MAP or MAF sensor signal, restricted injectors, or an inaccurate upstream oxygen sensor. The most common cause of this code would be the upstream oxygen sensor assuming fuel pressure is good, if the engine appears to be running rich yet is setting a lean code then it will be the sensor for sure.

Customer: replied 1 year ago.
What about emergency brake and gauges ?
Expert:  sprinkles08 replied 1 year ago.

The site asks that a separate question be opened for unrelated problems.

Are warning lights also coming on?

Customer: replied 1 year ago.
Just the parking brake
Customer: replied 1 year ago.
I saw another code now, p0507
Customer: replied 1 year ago.
What that means?
Expert:  sprinkles08 replied 1 year ago.

No gauges are working at all then?

Customer: replied 1 year ago.
Expert:  sprinkles08 replied 1 year ago.

Do you have an actual scan tool that will communicate with all modules?

Customer: replied 1 year ago.
I have a Maxsys Pro
Expert:  sprinkles08 replied 1 year ago.

Is it able to communicate with all modules?

Customer: replied 1 year ago.
Expert:  sprinkles08 replied 1 year ago.

Is the instrument cluster currently communicating on the bus? If so are there any codes set in it?

Customer: replied 1 year ago.
I replaced the instrument cluster and parking brake switch, now both are working, just need now fix the code P0171
Expert:  sprinkles08 replied 1 year ago.

Great!

Customer: replied 1 year ago.
still checking
Expert:  sprinkles08 replied 1 year ago.

Ok.

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