Offroad-Express

Has anybody had any experience with this product sold on Trademe?
It replaces the O2 sensor when the catalytic converter has been removed.
This is my problem - my converter is falling apart and will need replacing soon.
What are the replacement cost for a catalytic converter and o2 sensor?
Are there any other options out there?

id replace it with straight pipe.... not sure how legal it is these days, but i would think it was fine, as all those rice racers (well some of them) still get WOFs and you can almost garuntee they arnt paying for 3" high flow cats..

Sam

You can gut the cat converter and fill the void with a straight thru pipe, that way from the outside it still looks like you have a factory cat fitted.

But then you might get complaint from greenies

Thanks guys, my idea is to get rid of the cat, but the sensor will go haywire without the cat, and the engine light will stay on. Which is what I don't want. Plus of course without the sensor, the ECU will enrich the mixture, and the fuel economy will go belly up.
Any suggestions?
That is why I am looking at this Adjustable Oxygen Sensor simulator on Trademe

krokkie wrote:Thanks guys, my idea is to get rid of the cat, but the sensor will go haywire without the cat, and the engine light will stay on. Which is what I don't want. Plus of course without the sensor, the ECU will enrich the mixture, and the fuel economy will go belly up.
Any suggestions?
That is why I am looking at this Adjustable Oxygen Sensor simulator on Trademe

are you sure the sensor your looking at is the oxygen sensor? a lot of that jap stuff has a small sensor actually in the rear of the cat which brings up a light on the dash to say the cats overheated,oxygen sensors are generally before the cat mate and usually close to the engine.

This sensor is on the cat, in the middle.
I will have a look in the front towards the engine if I can see anything else.
If the oxygen sensor is not on the cat, can I just replace it. I read somewhere that if you remove the cat it screws up the sensor readings.
How safe is just replacing it with a resistor?

Cheers

more than likely what you looking at is what i described above,the oxy sensor will be closer to the engine,is it a v6 one?they usually have one sensor per bank or one just after where the two exhaust pipes merge into one usually have 3-4 wires on them,if the cat is downstream from this then you are safe to remove it,i wouldnt try and dodgy it as the engine ecu uses this to determine fuel mixture

adogg wrote:

krokkie wrote:Thanks guys, my idea is to get rid of the cat, but the sensor will go haywire without the cat, and the engine light will stay on. Which is what I don't want. Plus of course without the sensor, the ECU will enrich the mixture, and the fuel economy will go belly up.
Any suggestions?
That is why I am looking at this Adjustable Oxygen Sensor simulator on Trademe

are you sure the sensor your looking at is the oxygen sensor? a lot of that jap stuff has a small sensor actually in the rear of the cat which brings up a light on the dash to say the cats overheated,oxygen sensors are generally before the cat mate and usually close to the engine.

Actually in a system that can tell cat efficiency or effectiveness, there are two O2 sensors (one before the cat and the second just after). The difference between the two readings tells the computer how well the cat is performing. For such applications, a missing cat will cause an alarm code. If you have only one sensor and it is before the cat (towards the engine) and you remove the cat, the engine computer has no way of knowing that the cat is missing now!!! I can detect its absence since there are no sensors.

So check how many sensors do you have total and where. Besides, a new hiflow cat is not that expensive. I have had mine replaced for around $280 fitted. O2 sensor was about $160 fitted.

Thanks for all the help, I will have a look for the position of the o2 sensor/s.

Is it on a Pajero?

If so, replacing the cat with a straight pipe and not having the sensor pluged in will not cause a check engine reading. I have done this.

There is a seperate oxygen sensor.

The sensor that is now not inside the cat is just still plugged in but tied up out of the way, and my fuel economy is pretty good.

That is good news.
Will it pass WOF with a straight through pipe?

May I ask what your fuel economy is?
I'm getting around 5km/litre.

Mine is WOF'd!

Open road - 11 to 12l/100km
Around town - 12 to 14l/100km
4WD - 14 to 25l/100km (25 only in extreme cases!)

Average over thousands of km (incl 4WD as that is all it is used for) Between 13 & 15l/100km.

3.5 litre SWB Manual.

Cheers for that.

I had a look, and it seems the oxygen sensor is where the two banks join, and it appears to be a 4 wire, but I couldn't really see that well.

Yes, 4 wire