P1173 OBDII code
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Thread: P1173 OBDII code

  1. #1
    FRESHMAN ROVER
    Join Date
    April 8th, 2008
    Location
    Seattle, WA
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    54

    P1173 OBDII code

    Just got this code over the weekend. I've searched this forum and nobody else seems to have ever got it. Oh well from the looks of things it seems to be a bad HO2S on the right side. Has anyone replaced an o2 sensor themselves? Sounds like an ineresting /First DIY job on my new baby!

    The full error from a forum post.
    P1173 Downstream fuel trim malfunction (bank 2) Front sensor aged - rear HO2S adaption too lean/too rich RH bank (NAS and EU-3 only)

    http://www.canobd2.com describes the error as:
    P1173 - Land Rover - Lambda sensor aging tv bank 2\nDrive cycle C:Signal out of range - above maximum.\n
    2004 White/Tan RR

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  3. #2
    SGW
    SGW is offline
    FRESHMAN ROVER
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    September 29th, 2007
    Location
    Headcorn Kent UK
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    Replacement of an O2 sensor is easy, put suspension in max height mode and slide underneath. Locate the defective sensor, unplug the connector, and unscrew the sensor. Replacement is the reversal of the above.
    As they say!!!
    Stewart.
    Owned first RR in 1978 had 5 since. Present one's 2002 Giverny Green Vogue and 2002 Giverny Green HSE both 4.4 LPG.

  4. #3
    FRESHMAN ROVER
    Join Date
    April 8th, 2008
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    Seattle, WA
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    THANKS SGW!
    2004 White/Tan RR

  5. #4
    FRESHMAN ROVER
    Join Date
    June 5th, 2008
    Posts
    93

    Re: P1173 OBDII code

    I just got this code today on my 03 Range....Did you replace that 02 Sensor....was it easy and did it work?
    2003 Range Rover HSE
    To Own a Range Rover
    Was a Life Long Dream!!!!

  6. #5
    Premium Member
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    December 28th, 2005
    Location
    Kilkhampton, Cornwall, UK
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    1,985

    Re: P1173 OBDII code

    I had this code when my PCV hoses broke down, once replaced and cleared they never came back.... It might be worth checking yours:

    http://www.rangerovers.net/forum/vie...hp?f=2&t=28533
    1999 4.6 HSE Blenheim Silver

  7. #6
    LEGACY VENDOR
    Join Date
    August 15th, 2006
    Location
    Blackburn, UK
    Posts
    1,675

    Re: P1173 OBDII code

    J. Millionaire also had the same error flagged, but on the LH rather than the RH bank (P1170).

    See end of this thread :

    viewtopic.php?f=2&t=14964

    Phil
    2003 4.4l V8 Range Rover Vogue

  8. #7
    Premium Member
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    January 1st, 2005
    Location
    Truckee/Tahoe
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    1,902

    Re: P1173 OBDII code

    Check the hoses first. Like Dan said, I went thru this last year replacing O2 sensors, and a bunch of other bits,(spent a lot of time at going back and forth to the dealer, and unneeded expense) and it was the PCV hoses all along.

    Mark.

  9. #8
    darrinturner
    Guest

    Re: P1173 OBDII code

    These are the hoses that you should replace if indeed they are faulty
    http://www.xtremerovers.com/product_...products_id=12

    Take off the plastic baffle the covers the engine and reach back and squish the hoses, if the give easily or they already have oil leaking from them, then you should replace.

  10. #9
    FRESHMAN ROVER
    Join Date
    June 5th, 2008
    Posts
    93

    Re: P1173 OBDII code

    Dont know if this helps but my mpg readings have been a little irradic and low as of late......I have been down to as low as 9.8 now I know that 02 sensors affect this and so pcv hoses but would one be more likely to affect the readings then the other? thanks for the info.
    2003 Range Rover HSE
    To Own a Range Rover
    Was a Life Long Dream!!!!

  11. #10
    Premium Member
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    December 28th, 2005
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    Kilkhampton, Cornwall, UK
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    1,985

    Re: P1173 OBDII code

    If the PCV hoses are leaking then you will have poor mpg, and if its really bad you'll have a rough idle too. This in itself can cause an 02 sensor error....
    1999 4.6 HSE Blenheim Silver

  12. #11
    FRESHMAN ROVER
    Join Date
    April 8th, 2008
    Location
    Seattle, WA
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    Re: P1173 OBDII code

    hey exquizit23,

    I never got to replacing the sensor. I've not been driving the truck much and i'm planning a winter wonderland trip to SLC Utah throught hose tretcherous mountains from seattle. I need to get the car clean of errors and ready. I'm going to be investigating the Hoses and probably will replace the sensor since I've had a new one sitting in my garage for months now. I just couldnt find the front right sensor. I could only see one sensor on the right side and didnt know if that was the front right or rear right. There were also two cylinders resembling CAT's so i couldnt tell which one was the cat. The sensor was between the two cylinders
    2004 White/Tan RR

  13. #12
    Premium Member
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    Truckee/Tahoe
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    1,902

    Re: P1173 OBDII code

    You do know the first big storm of the year is coming ashore this weekend? If the hoses fix the air leak (that may be the cause of the CELs) you should self clear after a few miles and starts.

    Mark.

  14. #13
    FRESHMAN ROVER
    Join Date
    June 5th, 2008
    Posts
    93

    Re: P1173 OBDII code

    I have checked those two hoses up top (PCV hoses).....Mines has some sort of heat sink protective cover over them and they look fine. I have tried flopping the two upstream sensors and resetting the code to see if the code changes and it didn't. Don't know what else to do? Could it be the MAF sensor gone bad? I have noticed that my lower rad hoses has a slight slit in it but don't think that could be the cause of my problem could it? NEED HELP
    2003 Range Rover HSE
    To Own a Range Rover
    Was a Life Long Dream!!!!

  15. #14
    JUNIOR ROVER
    Join Date
    April 2nd, 2007
    Posts
    561

    Re: P1173 OBDII code

    I would say try to replace the MAF that is what caused it on my MB, but normally both banks will give you a fuel trim malfunction if that is the case.
    2011 Range Rover HSE LUX

  16. #15
    FRESHMAN ROVER
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    February 11th, 2009
    Location
    Norman, Oklahoma
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    131

    Re: P1173 OBDII code

    PCV HOSES.
    06 RR Wesminster S/C
    99 Ferrari 355 F1 Spider
    06 Lambo Gallardo Spyder

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