Lambda Sensor changing mk4 golf

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OO hubbys car had a problem today. The Oxygen sensor \ lamba sensor had gone to oxy heaven. He scanned it with a diagnostic thingy and it says 17604 oxygen lambda sensor circuit b1 s1 electrical malfunction" his freind said its the one before the cat (whatever that is, I'm sure I have no animals under my bonet, not that I check lol)

There is a bit of room to get at the sucker (his words) but it is simple a case of just un screwing it after youdisconnect the wiring loom bit and fitting the replacement and putting the elctrical plug back on ?

I said maybe he should spray it with WD40 and leave it overnight then try and unscrew the thingy magig.

I nearly spat a chocolate digestive when he said its 127 + vat for a new one and 60 for a garage to fit it. Hes quite handy at car stuff. He did my front brakes, and brake slight switch on a mk4 aswell. So sure I'm he can unscrew a blobby thing and put a new one in or does this requite some special tool other than a spanner ?

He can clear the fault on his scanner tool/

ooo this is for his mk4 golf 1.6 2001 his daily runner.

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Sarah wrote:

there is a special socket for the job, without it he may find it difficult to undo

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he was just gonna use an adjustable spanner type tool like for his pedal bike.

I might see if I can find it this tool on ebay for cheap.

By any chance do you know the size I need or all they all generic ?

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they are 22 mm & as Mr Cheerful says you need a special socket with a cut out in it. Dont use an adjustable you will round it off & then wont be able to undo it properly.

heres one on ebay http://tinyurl.com/5qr6hy but your local Halfords or the like will have one.

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You only need the special socket to do them up, you can undo them with a pair of side cutters & a normal deep socket.

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Forgot to ask, is it ok to drive the car like this or will it damage something ?

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Sarah wrote:

It won't do the cat any goos for a start.

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Oh No thats sounds expensive. I was just reading and it says it you have lambda problems it can cause the cat to crack! if you don't fix it. Also it can be another problem and not the cat like a fowled spark plug or a air leak in the exhaust manifold which I guess needs checking before forking out for a sensor! So I guess a few things need investigating first.

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On 15/07/2008 17:58, Mrcheerful wrote:

Most of which when they encounter a properly stuck tight sensor need a jubilee clip round them to stop them springing open. Tighten the jub clip on the socket before fitting so it's formed to shape. Remove jub clip from socket, slide jub clip over connector and down the wire. Fit socket into jub clip, then over the sensor hex and and re-tighten the jub clip.

I've got one that's in so tight it's broke a 3/8 drive extension. Did have a 3/8-1/2" adapter and a 1/2" breaker bar on it, something had to give. Not in a location that can be spannered in the car as it's on turbo elbow and in a space between head, firewall, manifold and ABS. Is genuine and still working so cutting the wire isn't preferred. The turbo is dead and engine is now out. It's resisted a 5 ft scaffold pole on a 1/2 T bar, even with the jubilee clip the socket just expanded and jumped over the hex. It's resisted the big adjustable being hit with a 2 lb hammer. There again generic 3 wire zirconia 1V on/off are under £10. But I really need it loose so that when the turbo goes back in the sensor can be replaced on the car without removing the engine and getting a grinder on it.

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Peter Hill
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On Tue, 05 Mar 2013 08:33:42 -0000, Peter Hill

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When you're getting the dead one out you can cut the wire off. (Not helpfull if you're trying to reuse it but most people aren't)

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Can you clean a lambda ?

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You can, and i have had some success doing so, but only usually after carbon fouling from an unrelated problem (causing rich mixture) but i would suggest in your case to replace the sensor.

Don't be tempted to use a cheap generic one, they dont last very long, and often give running and emissions related problems.

Tim..

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He managed to find a genuine this morning on shelf at car place, they said exactly the same thing to. And it has all the connector block bitsies so their is so soldering involved as with cheaper ones.

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127 + vat!!!! where from? I had to change two on my golf v6 4motion and they cost me about 83 + vat each - from VW. Fitting, I took it to a VW specialist who charged an hours labour (35). Is the 127 + vat price the price the garage has told you. Suggest you check with VW.

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Slider wrote:

some vw ones are that much, vw polo one for instance

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Yes, but the 127 was for a mk4 golf, as were the two I bought for 83 each. To the OP, do you know the engine type code of your car (first 3 characters of your engine number, will be something like AEH, AGZ, AUE...) I have ETKA (VW/Audi parts software) and can check part numbers etc

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OO that would be really handy. The engine number is AZD.

Thanks Slider.

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AZD should be using a 5 wire sensor so 127 price is about correct

Graham

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wrote:

Thats an FSI is it not? But in any case- yes it should be a narrow band titanium 5 wire-er.

Tim..

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wrote:

It's a mk4 golf not a mk5

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