If the defect described above is determined in conjunction with various error codes associated with the lambda sensors upstream and downstream of the catalytic converter, the cause could be the ingress of moisture into the engine wiring harness. The resulting corrosion on the plug connections can trigger the various error entries. A critical point which is generally diagnosed as the cause is the plug connection on the thermostat.
As part of the fault diagnostic process on these vehicle models, the wiring harness should be checked; if necessary, replace the thermostat and the associated connector.
Repair note
The problem has been detected by the vehicle manufacturer and prevented by a technical change in production effective from model year 2011.
Please observe the vehicle manufacturer's repair and maintenance instructions in this regard.
This defect may also occur in other models from this manufacturer with the same engine.
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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