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Discussion Starter #1
Hi all,
I have decided to replace the O2 sensor in my mk1 (there are no sign on the dashboard). I have seen several sizes 400mm, 530mm and 145mm and at some places they even show with 2 or 4 wires. I was wondering if the size plays any rolle, and I am not even sure if it has to be with a 2 or 4 wires.

Anyone have an idea which one I should choose?
 

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Meh.
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Best bet to at least get you started would be to walk into a parts store, give them your car's info, and see what products they show you. I know on North American model Zetec engines, the O2 sensors are four wire with an upstream sensor with an internal heat sensor and a downstream sensor that does not have a heat sensor. I don't know what sizes they are.

You can also try looking up your car on Rockauto.com. They will probably show you your options as well.
 

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Discussion Starter #3
thanks for the link o2fordsvt,
I did ask one shop he only mentioned the one with 4 wires, but when looking up at some online shops I see there are also with two wires.
Do you think the length of a sensor can be important?
 

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The sizes you mentioned are for the length of the wire harness. Yes, that does matter.

In the States, we can call any Ford dealer Parts Department, give them the car VIN, and they can tell you exactly what you need. They do not like handing out part numbers, but they will if you ask nicely. Can you do the same or similar over there?
 

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Pretty much all Ford O2 have used four wires since like '96 or so, the two wire are for models with no heaters in them. The mm. measurements are for harness length, and just try to put a 100mm. harness where you need 200 mm. and see if that is important.......excess length is generally not a problem unless you are one who lets the excess lay directly on say the exhaust manifold..............
 

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Most cars here have 2. Again, this and the other question you asked can most likely be answered by Ford. They are only one phone call away.

What is your reason for replacing the O2 sensor? Do you have a DTC? Have you had your car scanned for DTC's? Scan tools can tell you/show you info about the health of your O2 sensors.

Sky Ford - Watford
202 Rickmansworth Road
Croxley Green
Watford
Hertfordshire
WD18 7GH
Phone 01923 220550
Fax 01923 220557
Email [email protected]

Blackaby & Pearce - Harrow
101 Headstone Road
Harrow
Greater London
HA1 1PG
Phone 0208 427 3841
Fax 0208 861 4131

Priests - Chesham
Latimer Road
Chesham
Buckinghamshire
HP5 1QQ
Phone 01494 784491
Fax 01494 782985

SMC Ford - Uxbridge
139 Cowley Road
Uxbridge
Middlesex
UB8 2AG
Phone 01895 232425
Fax 01895 810765

Quickco - Borehamwood
Sterling Way
Borehamwood
Herts
WD6 2AX
Phone 020 8207 3100
Fax 020 8327 3406

Trust Ford - Edgware Rd
319 The Hyde
Edgware Road
Edgware
London
NW9 6TH
Phone 0208 358 8600
Fax 0208 358 8601

Sky Ford - Hemel Hempstead
Redbourn Road
Cupid Green
Hemel Hempstead
Hertfordshire
HP2 7AZ
Phone 01442 220200
Fax 01442 258798
Email [email protected]
 

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Two sensors are the current minimum (my later model has three).

First one tells the computer how the engine is running so it can adjust the fuel amount injected, second is used in reference to the first to determine if the CAT is cleaning the exhaust.

Earlier fuel injected engines just used one for feedback to the computer.
 
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