Pre-Cat O2 sensor
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Because advice is honestly and freely given in this technical section, much of it will be amateur experienced based, so any information is given in good faith and is not guaranteed as correct.
Not many rules really, this board being aimed at technical issues, it shouldn't fall foul (hopefully) of some of the more personal issues that can affect forums.
Rule 1 - Is that you need to think very carefully before posting anything technical or asking anything technical relating to the security system of the car - See 'Security Issues' sticky for more info.
Rule 2 - We (MGF Register) do not support copyright infringement and therefore references to CD ROM, PDF versions or paper copies of the workshop manual (for instance) should not be posted on the forum. We don't want to get into trouble and we'd rather sell you a genuine hard copy through our Regalia shop anyway!
Because advice is honestly and freely given in this technical section, much of it will be amateur experienced based, so any information is given in good faith and is not guaranteed as correct.
- stux99
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- Model of Car: TF/TF Steppy/MGGS/3
- Location: Somerset/Dorset border
Pre-Cat O2 sensor
Help! Is changing this a DIY job?
Also, huge price differences when searching, best value place to buy?
Stu
Also, huge price differences when searching, best value place to buy?
Stu
- Steve White
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Re: Pre-Cat O2 sensor
I purchased one recently on ebay from MGManialtd (Glen Sprigg), which was the genuine MG part. £35 + postage
Changing them can be a pain. It all depends how easily the old one can be removed. I can be easier to remove that section of exhaust and remove the old sensor once the exhuast is off the car.
Personally I would get a garage to do it, but then I'm lucky enough to have Techspeed on my doorstep.
http://cgi.ebay.co.uk/MGZR-MGZS-MG-ZR-M ... 45f0f63ff5
Changing them can be a pain. It all depends how easily the old one can be removed. I can be easier to remove that section of exhaust and remove the old sensor once the exhuast is off the car.
Personally I would get a garage to do it, but then I'm lucky enough to have Techspeed on my doorstep.
http://cgi.ebay.co.uk/MGZR-MGZS-MG-ZR-M ... 45f0f63ff5
Re: Pre-Cat O2 sensor
A common problem is tearing of the female thread in the exhaust. Do not buy a new exhaust but get an engine shop to fit a spark plug helicoil insert.
Geoff F.
Geoff F.
- stux99
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Re: Pre-Cat O2 sensor
Thanks for the quick response guys.
Mgmania is where I was looking.I will have a go
Stu
Mgmania is where I was looking.I will have a go
Stu
- Rob Bell
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Re: Pre-Cat O2 sensor
Lambda sensors always seem to weld themselves in their threads in the down pipe. You're more likely to break your lambda removing tool than you are to actually getting the darn thing out. I suspect a bit of local heat, applied with an oxyacetylene torch or similar is the way to go...
- stux99
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Re: Pre-Cat O2 sensor
Got my sensor today, one more question, will I need to take off engine cover to unplug it or can it be reached from below?
Thanks in advance
Thanks in advance
- Rob Bell
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Re: Pre-Cat O2 sensor
Best access will be from above Stu.
You're going to absolutely love this job. I recommend industrial quantities of tea and a lorry load of jaffa cakes. And more than likely more than one Lambda removing socket. And ideally a heat source.
Let us know how you get on, and what the grazed knuckle count ends up as
You're going to absolutely love this job. I recommend industrial quantities of tea and a lorry load of jaffa cakes. And more than likely more than one Lambda removing socket. And ideally a heat source.
Let us know how you get on, and what the grazed knuckle count ends up as
Re: Pre-Cat O2 sensor
My advice? Take the manifold (if EU2/MEMS1.9/2) or downpipe (if EU3/MEMS3) off and put it in a soft jawed vice. You can get full swing at the sensor, and less likely to injure yourself..
Re: Pre-Cat O2 sensor
A Lambda Removing Socket has a cutout for the cable connection. Cut the cable off and use a good quality long socket or if available, a cranked ring spanner. Fit new bit with Sensor socket.
Geoff F.
Geoff F.
- stux99
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- Joined: Mon Oct 08, 2007 5:18 pm
- MGF Register Region: Somerset & Dorset
- Model of Car: TF/TF Steppy/MGGS/3
- Location: Somerset/Dorset border
Re: Pre-Cat O2 sensor
Thanks for all your advice guys, what a surprise
One tap and it came loose, did'nt even have to cut the wires.
So, plugs and leads and sensor done in 90 mins
I'm off for a Fursty Ferret now
One tap and it came loose, did'nt even have to cut the wires.
So, plugs and leads and sensor done in 90 mins
I'm off for a Fursty Ferret now
- colintf
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Re: Pre-Cat O2 sensor
good result then Stu!
Colin Murrell
MGF Register International Liaison Rep
MGF Register Regional Rep for Devon & Cornwall and Cotswold Regions
MGCC Z and V8 Registers Reps for V8 ZT'/ZTTs
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