Audi A4 - Bad or fluctuating idling behaviour | HELLA
Audi A4
2.0i 16V TSFI Quattro
Engine code: CDNC
Model year: 2009-2012
Bad or fluctuating idling behaviour
Whistling noises in idle
Motor control light on
Fault codes:
P0507 RPM over set point
P2187 Too lean a mixture at idle speed
If the defect mentioned above is discovered in combination with the fault codes described, a faulty oil trap (figure) in the crankcase ventilation at the cylinder head cover may be a possible cause.
There are pressure control and check valves installed in the oil trap housing. They regulate the suction of the blow-by gases according to the engine speed and the pressure ratio. An error in this area can cause speed fluctuations and a higher consumption of oil. In some cases, the vehicle switches off right after it is started.
Repair notes
The oil trap must be completely replaced in the event of damage as it cannot be disassembled or cleaned.
Please observe the repair notes issued by the relevant vehicle manufacturers in this context.
Important safety note
Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.
Reprinting, distribution, reproduction, exploitation in any form or disclosure of the contents of this document, even in part, is prohibited without our express, written approval and indication of the source. The schematic illustrations, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and cannot be used as a basis for installation or assembly work. All rights reserved.
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