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[amba]

Just a bit of advise please.

After the last few days of having the eml on/thenoff/then on and doing paperclip test and reading code "89" open circuit 02 sensor n/s,I have decided to start with what I hope is the obvious cause.Replace Lambda sensor.

I have a near new one from a previous cat I have so will just swop them over and see if that cures problem.

Any tips I should be aware of when trying to remove ?..assume a good soak with plus gas over a day or so ,and imagine a ring type spanner would be better chioce of weapon.?

[JamesV6CDX]

Hi Amba,

I don't think you'll get a ring spanner on there, as you won't get the loom electrical connector through the ring.

Using an open ended / adjustable spanner isn't all that advisable, because it can easily round the edges, causing you a whole lot of hassle.

My advice would be to get a lambda socket, which is a 22mm deep reach socket with flat edges, and is modified to fit around the wires.

This, combined with 24hrs of a few plusgas soakings, is your best bet. Also might be wise to try and remove while warm, but that's your choice. If you do - be careful of burning yourself, obviously.

Kind regards,
James

[amba]

Top advise,James.

Much appreciated..will source one from machine mart in the morning.

Thanks again

[Brikhead]

I've managed to remove four of these from Omega's recently using a large adjustable spanner and a lump hammer...

[amba]

Think I will use the correct wrench as have had bad experiences with adjustable spanners and really need it to come out cleanly as attached to car.

Thanks anyway,Brikhead

[JamesV6CDX]

Think I will use the correct wrench as have had bad experiences with adjustable spanners and really need it to come out cleanly as attached to car.

Thanks anyway,Brikhead

Hi Amba,

I agree. Whilst it is often possible to do the job with an adjustable (I have indeed done it myself), the small cost of buying the correct socket, far outweighs the inconvenience and cost you will incur, should the sensor become rounded.

Kind regards,
James

[amba]

Just checked Machine Marts website and they are around £20=00,so even if I only use it the once I am sure it will be safer than an adjustable.

What with cold hands ,damp concrete driveway and low temperatures I want the least amount of grief removing and replacing it.

Lets hope it cures the light staying on.!!

[JamesV6CDX]

Hi Amba,

Do you have the facility to look at live-data?

I would recommend checking all of the relevent values, before condemning the sensor and going to the trouble of buying tools / replacing it in bad weather.

It may be that the fault code is a knock on effect from another problem, which you would spot if you looked at all the values on a screen.

Forgive me if you've done this already, of course - as I don't know any history behind this.

Kind regards,
James

[amba]

Thanks for further advise,James.

Brief history: is I had the n/s cat replaced about 2 months ago as cheap aftermarket one was driving me mad.

Bought second hand original GM unit with a lambda fitted.Got this replaced at same time as I had the n/s exhaust manifold gasket replaced by local trusted garage.

Last Saturday whilst driving in heavy deep snow eml flashed on/off.When got home read fault codes and it gave me 89.

Monday driving again in snow eml was on/off and staying on so assumed same fault.Checked codes again and only 1 present was 89.

Tuesday snow had all but cleared and after driving some 150 miles no light appeared at all.

Just went down to local shops today and within 2 miles of home light was back on/off and then staying on.It doesn,t stay on when started from standstill but seems only to appear when car is warmed up and mobile.

My logic was as had spare near new lambda and unsure of age or condition of that on now fitted cat would take the quickest/cheapest option and just replace sensor first.

No live data has been carried our as sure most local garages would charge silly money for just a few minutes on a machine.

[Marks DTM Calib]

Past experience sudgests that you wont see a great deal from live data on lambdas.

A plot sometimes helps.

Also, code 89 is often a goosed or lazy sensor (and rarely affects the emmisions!)

[amba]

So my logic of replacing lambda is sound then ?

[2woody]

just remember DO NOT use plus-gas on the near-new lambda you're hoping to use. The slightest snifter of silicon fatally poisons a lambda sensor.

also clean the boss thoroughly to get rid of silicon, etc.

[amba]

Assuming the nearly new lambda in the aftermarket cat is stuck fast what is the best method to free it up then ?

I suppose its ok to put plusgas on the old doddgy 1 and when removed give the boss a good clean?..again with what.?