Important! : engine light (lambda problem)

1. saxo_vtr_1994 Frequent Poster Joined: Dec 2010 Newcastle Posts: 571 2002 Black Saxo VTR (gone) 2002 White Saxo VTR

   #1 21st May 2013, 17:39

   Engine light is on my saxo, had it pluggged in and it came up with these codes
   P0171 adaptation mixture control
   P0134 upstream oxygen sensor
   I've swapped the front lambda sensor and now have these codes
   P0135 02 sensor heater circuit front
   P0134 upstream oxygen sensor
   What could it be? Could the sensor I've swapped be broke aswell?
   cheers
2. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #2 21st May 2013, 18:16

   Did you clear the codes after replacing the lambda mate?
3. saxo_vtr_1994 Frequent Poster Joined: Dec 2010 Newcastle Posts: 571 2002 Black Saxo VTR (gone) 2002 White Saxo VTR

   #3 21st May 2013, 18:29

   Yer but came back on
   Got told to clear again then take battery off and take for a drive, so done this and didn't come back on so I'll just see wat happens
4. saxo_vtr_1994 Frequent Poster Joined: Dec 2010 Newcastle Posts: 571 2002 Black Saxo VTR (gone) 2002 White Saxo VTR

   #4 21st May 2013, 19:13

   Light is back on, anyone any ideas?
5. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #5 21st May 2013, 19:45

   When you fitted the lambda sensor was it a new or used one?
6. saxo_vtr_1994 Frequent Poster Joined: Dec 2010 Newcastle Posts: 571 2002 Black Saxo VTR (gone) 2002 White Saxo VTR

   #6 22nd May 2013, 00:18

   Used one but the lad says it was fine, I know I've only got his word on that tho so might be broke aswell
7. Manu Saxperience Addict Joined: Dec 2009 Posts: 11714 A6 Le Mans tuned/A3 TFSI tuned

   #7 22nd May 2013, 09:45

   Is your car running rich a bit?
8. saxo_vtr_1994 Frequent Poster Joined: Dec 2010 Newcastle Posts: 571 2002 Black Saxo VTR (gone) 2002 White Saxo VTR

   #8 22nd May 2013, 15:54

   Yer deffo running rich, stinks of petrol at back of exhaust
9. Bedford126 Saxperience Post Whore Joined: Jul 2010 Morley, Leeds Posts: 8469 Civic ep3 type r powered by TDI NORTH

   #9 22nd May 2013, 16:51

   Map sensor mate i had the same codes as you last year and replaced everything. Replace the map sensor then clean both lambdas with brake cleaner to get rid of the soot and it should run okay.
10. saxo_vtr_1994 Frequent Poster Joined: Dec 2010 Newcastle Posts: 571 2002 Black Saxo VTR (gone) 2002 White Saxo VTR

    #10 22nd May 2013, 16:56

    Cheers mate I'll start sourcing a new map sensor now
11. saxo_vtr_1994 Frequent Poster Joined: Dec 2010 Newcastle Posts: 571 2002 Black Saxo VTR (gone) 2002 White Saxo VTR

    #11 23rd May 2013, 00:03

    changed map and cleared codes light came straight back on
12. richy_t_123 Frequent Poster Joined: Mar 2009 newcastle Posts: 980 2002 silver vts

    #12 23rd May 2013, 10:18

    You checked what coads are on now mate? As said you can come along and try a few sensors out if you want untill you find the fault
13. Manu Saxperience Addict Joined: Dec 2009 Posts: 11714 A6 Le Mans tuned/A3 TFSI tuned

    #13 23rd May 2013, 10:37

    Quote:

    Originally Posted by saxo_vtr_1994 Yer deffo running rich, stinks of petrol at back of exhaust

    probably why it's sending the sensors all over the place. Your cat converter / sensors may also be clogged up or damaged, they don't cope well with overfuelling and the overheating problems that come along.
    
    If it stinks of petrol then the fuel going through the engine isn't burnt obviously. You're supposed to keep a ratio of 14 volumes of air for 1 volume of fuel to maintain efficiency. I'd check the air filter and make sure it's flowing properly.
14. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

    #14 23rd May 2013, 11:47

    I bet your air filter is black,check theres not a crack in the exhaust manifold & the gasses aren`t being sucked back up.
15. saxo_vtr_1994 Frequent Poster Joined: Dec 2010 Newcastle Posts: 571 2002 Black Saxo VTR (gone) 2002 White Saxo VTR

    #15 27th May 2013, 01:10

    checked filter not dirty, will check manifold tomorro,
    codes still say upstrem lamba, is this the frist or second lamda?
    cheers
16. Manu Saxperience Addict Joined: Dec 2009 Posts: 11714 A6 Le Mans tuned/A3 TFSI tuned

    #16 27th May 2013, 09:35

    it's the top one. And when it fails the car overfuels like I suspected above, goes hand in hand really. Since you ruled out the air filter, I think you only need to worry about that sensor.
    
    I'd do it sooner than later as it could cost you a fair bit of petrol, and potentially damage the cat.