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Thread: 3.2 - P0170 & P0173 fault codes

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    Default 3.2 - P0170 & P0173 fault codes

    I had these P0170 and P0173 fault codes for some weeks in my car, 2003 3.2 Vectra.

    P0170 Fuel trim malfunction (Bank 1)
    P0173 Fuel trim malfunction (Bank 2)

    I checked that there are no leaks in the flex-pipe from MAF to throttle body. I've searched the web for these codes, and most of the cases these codes (together) are referring to MAF-problems.

    I cleared the error codes, and I think that I will try to clean the MAF first with CRC air sensor cleaner, similar to http://www.crcindustries.com/auto/co..._ss.aspx?ID=90

    Any other suggestions that I could try? How much these Bosch MAF's cost?

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    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

    Default

    Hi Jay, have a 3.2 myself but can't help you out - sorry.

    However, I don't know how much the CRC cleaner is, but here's an alternative as used by some of us on the forum http://www.maplin.co.uk/module.aspx?moduleno=28994

    Hope you get it sorted.

    EDIT - this thread seems to point towards the MAF. HTH. http://www.ilexa.co.uk/forum/index.p...topic=17821.10
    Last edited by gtr1000; 21st August 2009 at 12:34.

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    Hi gtr1000, I think the CRC is about 10€ (£8) and easily available in Finland, going to pick it within two hours..

    Also this thread points to MAF: http://www.omegaowners.com/forum/YaBB.pl?num=1219699194

    Would any error code reader help, like ELM327 -based perhaps? http://www.uiftech.com/productInfo.j...D=55&intPage=1

    I was thinking that maybe those readers will show live data from MAF, lambdas and fuel system.

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    It could also be an air leak or a blocked hose that leads to the TB. Any amount of excess air being sucked in after the MAF could through up a light as it cannot adjust the mixture enough to compensate hence the O2 fault.
    Now I need a turbo to keep up!

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    I cleaned the MAF today, still I have to erase the error codes, no reader yet so it seems that I'll have to unplug the battery. The cost of new Bosch MAF in Finland - 379€ ~£300

    The hoses seems to be ok, I'll have to check them for any blockings...

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    Its a bosch part so try googling the part number. Maybe fitted to something cheaper too
    Now I need a turbo to keep up!

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    I received the ELM327 today, and after a quick check it seems that the idle short term fuel trim value is the reason for the error code, it fluctuates a lot, and is approx 20% in bank 1 and 2. I think I should check all the related hoses, but how to check them foolproof? And which ones to check?

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    All the hoses seems to be fine, no cracks etc. I made some measurements with ELM327 and wOBD v.1.51. (Pic.1:engine idle after driving in city, Pic.2:during highway drive, Pic.3:O2 during same highway, Pic.4:stop after same highway drive, Pic.5:O2 of Pic.4, pdf contains highres pics)

    Any comments?

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    Update: Yesterday I installed new MAF and cleared the error codes. Everything looked fine until today afternoon; The spanner is back.
    Engine is running fine though.

    I will check the fuel trim values with scantool again. Any ideas what could cause the fault codes?

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    Update: I have changed the plugs few days ago. Old plugs looked quite ok (they were driven 80000 miles). No extra oil found above the plugs so the rocker cover gaskets should be ok. The error codes reappeared, so the plug change did not help in that respect.

    I logged the data again, and it looks like the short term fuel trims goes >15% every time when I lift my foot from the throttle pedal. This indicates to some sort of a vacuum problem, I think. Is there a way to check the vacuum system?

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