Loving our recently a acquired 380GT. Thinking of changing the oxygen sensor/sensors, as the car is 10 years old and has done over 100 000km.

How many Oxygen Sensors are there? On the forums there seems to be mention of only one.
Where is it located. Perhaps there is more than one sensor, but only this one needs to be replaced.
I understand the brands are either Mitsubishi, NTN or NGK.

Cheers, John

The 380 has four oxygen sensors.
Two "pre-cat" (in the exhaust manifolds before the integrated pre-cats) and two "post-cat" (in the exhaust tube after the third dummy cat).
The wires/leads for them are all different lengths.
The OEM ones are plug and play and not that hard to fit, but they are fairly expensive. Not sure who makes them.
I bought generic replacement sensors (Denso) for a fraction of the price, but they took a fair bit of mucking about to fit. Cut and shut four wires on each sensor, so 16 wires to cut and join. Cut the electrical plug off the old sensor and join it to the new sensor. Don't solder, use crimps.
They worked perfectly OK.
So if you have the time and patience buy four of the generic ones.
After all that, I wouldn't bother replacing them on a car with not much more than 100,000 k unless or until you have symptoms that one or more are cactus.
The main give away is suddenly crap fuel economy with no other symptoms.

4 sensors.

Two at the front, clearly visible.
Two at the rear, hard to get to.

The two highest ones provide mixture feedback.
The two lowest ones provide catalyst efficiency feedback.

I would only change them if a check light comes on.
Unless you have hundreds of dollars to spend on unnecessary "maintenance"...:)

Genuine ones just plug straight in...aftermarket ones need plugs from old ones crimped on to replacement ones...the wire doesn't solder.

Don't do it.

As an example of how expensive the OEM ones are, check out this Fleabay listing for all four sensors (and that's with free postage!): http://www.ebay.com.au/itm/4x-New-Genuine-BOSCH-Oxygen-Sensor-O2-For-Mitsubishi-380-DB-3-8L-6G75-/121526351098?pt=LH_DefaultDomain_15&hash=item1c4b88f4fa

Genuine were about $105 ex when I changed one back at the end of 2013

Replacing all 4 will be a costly exercise and involve quite some work. Would only be worthwhile if the fuel consumption improves. Getting around 12.8 l/100km around town, but this is driving mildly. Will fit the Galant intake and see what happens.

Cheers guys and thanks for the input.

Hello.

I have a 1999 Magna Advance 3.5l 6V. I have a problem with fuel consumption (almost 30l/100km :cry: ) and need to replace oxyigen sensor but can't find location. Can some send me fotos or description?
Please help me.

Hello.

I have a 1999 Magna Advance 3.5l 6V. I have a problem with fuel consumption (almost 30l/100km :cry: ) and need to replace oxyigen sensor but can't find location. Can some send me fotos or description?
Please help me.

30L/100km average? Yes my car can do that if I just drive it the 500m to the local shops repeatedly and nothing else.

Best test for an oxygen sensor is to look at the INSTANTANEOUS fuel consumption with a hot engine and steady speeds of 60, 80, 100 KPH.
My TJ 2001 is a gas guzzler around town, but on a long trip out of town it averages 7.7L/100 km so I know the oxygen sensor is ok.

Another thing affecting the fuel consumption is the thermostat and temperature sender. How does your temperature guage behave?


In short, do some testing before you replace the oxygen sensor.