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Low RPM, Rough Idle and Excessive Fuel Consumption

Leenie gal

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Good Evening Brains trust,
I have a 2008 VE Commodore and of late it has idled at a very low 500rpm, is running rough and fuel consumption is excessive. I have gone from 440km to a tank to 360km (and I thought 440 was bad to start with). A mate put a computer reader on it for me and it came back with the following:

C0161-00/N
Fuel Metering Solenoid Valve Circuit
Range/performance

Does anybody have any idea of what I could be looking at? Fuel pump? It also has quite a pronounced rattle which is similar to what we used to call a tappet rattle in the old Holdens.
Hoping somebody can steeer a girl in the right direction.
 

mechanic

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Are you sure that code is correct? it doesn’t make sense. It’s a code for a brake light switch fault (I think).
 

Leenie gal

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Ahhhh I did have a brake light issue a while ago so possibly wasn’t cleared then
 
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