Hi Guys
I've got a Zafira 1.8.
Reported fault - spanner light comming on intermittantly coupled with stalling at junctions etc.
Usual code read
4 codes
P1525 - Electronic throttle limp home position malfunction.
P1526 - Electronic throttle addaption malfunction.
P1550 - electronic throttle in emergency mode.
P1555 - Throttle position TP sensor a/mass air flow (MAF) sensor implausable signal.
did the usual cleared codes.
Removed throttle assembly, cleaned (noting match above fault codes to know fixes in auto data.
Drive 20 miles all fine but driving down the A2 around 50mph (speed limit of A2) spanner light on but engine/idle fine. Re-code read. Only P1555 back noting no OBD Codes, No freeze frame.
Question - I concluded the throttle position sensor is in the electronic throttle unit, can anyone confirm this for me? Anyone had this before? Aren't intermittant faults great - I think not!!!

Did you clean all the breather connections ?, There is a TSB on P1555 on vauxhall TIS which mentions increasing the bore size of the small breather stub and then updating software with Tech 2

HTH

Tony

Hello Leslie
IF You need help with a Tech 2 and Updating the ECU give me a call as i am only down the road from you in Blackfen.
HTH
Terry
07956 451 402

Hi Terry
Sorry to be so long in answering your kind offer but I have been waiting to see what the outcome of what I have done has been.
After cleaning out the breather pipes, throttle housing and changing the air flow meter just over 450 miles of driving only fault code that returns is P1555. Driveability is fine no stalling or fluffing around at idle. So I may well contact you within the next couple of weeks to try checking the programme update as you offered. Failing that its looking like a throttle body change.
Hope to speak to you soon
Les Strong

I dont suppose anybody would have the details of this TIS?

I have a customer with just this problem and I would like to know what to advise him.