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Trouble Codes, wher do I go from here

Old 07-11-2014, 11:23 AM
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Join Date: Jul 2014
Posts: 32
Default Trouble Codes, wher do I go from here

I have a '98 2.2litre that I have codes P0446 and P0171
I am hoping someone could give me some direction from here.
Old 07-11-2014, 12:16 PM
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Location: PTW
Posts: 11,742

P0171 is fuel system to lean. Meaning the computer is needing to add fuel, as the original mixture is to lean.

Exhaust and intake air leaks
Low fuel pressure
Plugged injector (typically engine would run rough)
Bad MAP (seldom fails)
Engine coolant temp sensor
02/AF sensor failure (typically the first sensor on exhaust system)

P0446 is fuel tank evap control system.

You are going to need some kind of service info to understand this. Perhaps a Haynes manual which is low price.

VSV for vapor pressure sensor or EVAP valve (common)
Vapor pressure sensor (common)
Wiring issues (not common)
Cracks or damaged EVAP hoses or canister (happens)
Fuel tank over flow valve leaking (not common)

EVAP unit is under chassis in front of fuel tank.
Old 07-15-2014, 05:43 AM
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Join Date: Jul 2014
Posts: 32

Thanks Joey, I won't be able to get to these quickly. But when I do I will let you know how it turned out.
Old 07-15-2014, 06:25 AM
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Join Date: Jan 2014
Location: Ipswich QLD australia
Posts: 543

would you believe a faulty petrol cap seal or cap itself can give this reading ... worth checking any way

a guy was failed by emmisions test because mechanic didnt check the petrol cap seal and was tight eneough

P0446 is fuel tank evap control system........the list above grows .with every post .... so it could be anything

Last edited by dirty hands; 07-16-2014 at 06:59 AM.
Old 07-15-2014, 06:58 AM
Thread Starter
Join Date: Jul 2014
Posts: 32

That is so simple I will have to try that first. Thanks for the input.
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