Leon lambda sensor fault

[yorkie]

Hi - orange engine light came on today (Mk1 Leon 2002 20VT) and VAGCOM
reports the following :-

17524 - Oxygen (Lambda) Sensor Heating; B1 S1: Open Circuit
P1116 - 35-00 - -

17511 - Oxygen (Lambda) Sensor Heating; B1 S1: Performance too Low
P1103 - 35-00 - -

Anyone had these codes and resolved them yourself ? And which sensor is
the code relating to (B1 S1), pre or post cat ?

Ta,

Yorkie.

 

[Steve_B]

had a few problems with the lambda probes on my motor, not the ones you're seeing btw, the stealer fixed them under warranty. i would say you've got a bust lambda sensor but i'm sure the more knowledgeable ones on here will be able to confirm or deny that

sensor B1=S1 is the pre cat sensor and B1-S2 is the post cat sensor

 

[YerMother]

An open circuit fault normally comes on if you disconect something!

But as steve has said it's the pre cat oxygen sensor that is at fault

 

[yorkie]

Cheers guys - could someone give me a noddy guide to locating the pre-cat sensor so
I can check for loose wires etc....

 

[YerMother]

Cheers guys - could someone give me a noddy guide to locating the pre-cat sensor so
I can check for loose wires etc....

It's in the downpipe close to the turbo at the back of the engine! Don't go routing around there when the engine is hot

 

[yorkie]

Ta! I'll have a look see tomorrow...

 

[yorkie]

Me again - no luck locating the lambda sensor - I don't even known where the turbo is!!

For reference, I know where the DV is as I put a Forge one in there earlier this year.

Anyone got more numptie-like instructions for locating this thing (and what it looks like) ?

Ta.

 

[Feel]

Viewed from the back of the engine:

 

[yorkie]

That looks pretty numptie compatible! Cheers Phil

 

[Feel]

No Big.

While we're talking about Lambda faults - I had this one this morning:

16524 - O2 Sensor Circuit - Slow Response (Bank 1 Sensor 2) B

Anyone have any idea?

 

[yorkie]

Stuff it! Can't find the darn thing so it's booked in at the dealers

 

[YerMother]

No Big.

While we're talking about Lambda faults - I had this one this morning:

16524 - O2 Sensor Circuit - Slow Response (Bank 1 Sensor 2) B

Anyone have any idea?

Your car is slowly dying on you phil get a new one

They are not meant to last for the life of the car mate they are prone to failing due to the harsh environment they work in! But as you know with fault code, it may not be the raised fault that is the problem

 

[Feel]

Yeah, there was me feeling all chuffed that mine seemed to be running well after I put the green top in.

Then this morning it gave that characteristic little "chug" so I vag-com'd it. I gave me a "system too rich" error, which I cleared, then about 15mins later got a big hesitation and that Lambda one popped up

I hope it's just one of those "they do that from time to time" ones...

 

[YerMother]

Yeah, there was me feeling all chuffed that mine seemed to be running well after I put the green top in.

Then this morning it gave that characteristic little "chug" so I vag-com'd it. I gave me a "system too rich" error, which I cleared, then about 15mins later got a big hesitation and that Lambda one popped up

I hope it's just one of those "they do that from time to time" ones...

MAF could be causing both of them mate! you never know!

 

[Feel]

"those in the know" are say that a dodgy MAF is more Likely to give "system too lean" errors.

 

[YerMother]

Sorry "those in the know"

 

[Feel]

Rich "boosts like a mofo" Vern and Kev @ Revo

 

[YerMother]

I remember that! "Boosts like a mofo" quality technical term

 

[Ruddmeister]

"those in the know" are say that a dodgy MAF is more Likely to give "system too lean" errors.

Yep mine threw the Lambda fault code but it was the MAF, no "tooRich" code....suspect the Lambda code was due to running a little lean ....scary stuff.....MAF from GSF on exchange was cheaper than I thought though less than £100

 

[Feel]

I've had a MAF fault thrown before including the dash light and full limp mode - cleaned it and thought it was fine. Maybe it's not fine then...