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Faulty precat lambda sensor?

Discussion in 'Engine, Gearbox, Exhausts & Running Gear' started by hsustyle, Mar 20, 2017.

  1. hsustyle

    hsustyle ClioSport Club Member

    Joined:
    May 5, 2011
    Messages:
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    Location:
    Crowborough
    Car:
    FF200, FF182, C220
    Just need a bit of advice on my 182!

    -Eml is on, diagnostics reads precat O2 sensor

    -35 Mpg on long run compared to the 43+ I was getting in my 172 Cup

    -Pulls hard to 5k rpm then becomes flat and strained. Noticeably dips in power

    -idles fine, no spluttering or misfire

    Is my front lambda sensor shagged? I thought it might be a blowing exhaust but that was welded up and sorted.

    I am getting a slight whistling noise as the revs climb, just under full throttle.
    Car is standard apart from cat back Scorpion exhaust.
     
  2. hipwell

    hipwell

    Joined:
    Mar 15, 2010
    Messages:
    1,818
    Location:
    rotherham
    Car:
    monaco 172
    I recently had a similar problem, and what finally made me change the lambda was mpg dropping from 42 on the motorway to 31.

    Changed it at the weekend for a new Bosch unit from europarts and its back up to 42-44 on the motorway.

    I paid 51 quid with a mates trade discount but if you put the weekend discount code in you will get it for about 62 quid

    Whistle is probably the cat to manifold joint. Get a new one of those from renaultparts direct while your at it!
     
    hsustyle likes this.
  3. hsustyle

    hsustyle ClioSport Club Member

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    Location:
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    Car:
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    Appreciate the reply, ordered both
     
  4. da rok

    da rok

    Joined:
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    Location:
    south africa
    Car:
    renault clio 1.4 16v
    best way to see is put it on diagnostics and look at the swing of the sensor... if its not swinging to its full range or is biased to one side then sensor may be at fault... lambdas are a common problem though and are fairly easy to replace
     
  5. hsustyle

    hsustyle ClioSport Club Member

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    Location:
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    Car:
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    OK nice, I'll have this checked tomorrow, ordered a new lambda sensor, will fit this tomorrow
     
  6. leeds2592

    leeds2592 ClioSport Club Member

    Joined:
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    Location:
    Leeds
    Car:
    Bean 182
    Make sure you get some WD40 or something on it before hand. I tried to remove mine last week and neither lambda's would budge. I'm going to get a little blowtorch to apply some heat to try get them shifted.
     
  7. hsustyle

    hsustyle ClioSport Club Member

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    Location:
    Crowborough
    Car:
    FF200, FF182, C220
    I'll take it to my friendly neighborhood mechanic, he'll have to battle it out with the lambda sensor.
     
  8. midge

    midge ClioSport Club Member

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    Messages:
    5,414
    You can just swap the plugs round from pre/post as they are the same
     
  9. hsustyle

    hsustyle ClioSport Club Member

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    Location:
    Crowborough
    Car:
    FF200, FF182, C220
    Good to know!
     

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