It is worth disconnecting the battery for 20 minutes, this cures faults that have crept into the firmware.
Whilst the battery is disconnected it is worth while disconnecting any electrical plugs you can find under the bonnet which connect the modules to the wiring loom and checking for corrosion. If you are unsure about doing this then you need the help of someone who knows their way around under the bonnet.
Asking for help in your Regional Section on here is a good way to go.
P1125-08 might be the Throttle Body need cleaning of all the gunk that ends up in there.
Searching for c1550 brings up a fault code for the power steering.
There seems to be a fix and it will need some with Tech 2 code unit.
Field Remedy: 2224
Subject: Steering - DTC C1550 (61) set in EHPS resulting in lack of power steering
assistance
Models: Engines: Option:
Vectra-C 2002...2007 All
Complaint: DTC C1550 (61) set in EHPS resulting in lack of power steering assistance
Cause: Signal interference between EHPS ECU and ECM
Production: Failure code setting deactivated as of VIN W0L0ZCF3571106338.
Remedy:
In case of a customer complaint because of lack of power steering assistance, the variant
configuration in EHPS has to be programmed with TIS2000 as of DVD#80 (Tech2 version 80.000)
to avoid that DTC is set.
Proceed as follows: - Diagnostics - select (7) 2007 - select Vectra-C / Signum - select
Chassis - select EHPS (Electrohydraulic Power Steering) - select Programming - select
Program Variant ConfigurationNote: Do not exchange the hydraulic pump unit because of C1550
(61).
FunctionalGroup: M - Steering
Complaint Group: 04 - Electrical failures,06 - Failure Code Setting by Control Unit
Trouble Code: C1550 (61)
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