Oxygen Sensor

[Frenchy]

Scott, the Bosch ones seem to be the best, there is a bung from the factory on the downpipe from the turbo but it is widely recognised that they should be a good distance away from the turbo as the heat will fry them, i reently fitted an AFR and ended up fitting it in the crossver pipe under the tunnel fitted vertically, i know i was supposed to post pictures ! It ended up being a marathon mind you as 2 studs snapped when removing so it was a turbo off drill and re tap job, you could use the original as sited by Porsche if you want to change it out every now and again, i still think Porsche must have thought about this when deciding on location ??

 

[944Scott]

Gents

Have any of you replaced your Oxygen sensor (if you have one) with an aftermarket one. I have noticed several at reasonable prices (considering the marque) and I have thought about changing it as a matter of course.

 

[scam75]

I've got my lambda sensor in the afore mentioned factory bung. It seems to give good readings and has been there for over a year now with no ill effects. It looked absolutely fine when it was out during my rebuild. I think it's a good location as further down the exhaust you get more diluted or leaner readings. Stuart

 

[Frenchy]

Stu, disagree on that one, as long as the system is airtight the readings will be the same at the back tailpipe as anywhere else, innovate even sell a clamp attachment so you clip a probe on the rear tailpipe outlet. Mike Moores lambda gave up after a couple of years in that position so he moved his which made my descision to place mine where it is. Jim

 

[944Scott]

Sorry I dont thin I explained that well, I just wondered if anybody had used an aftermarket one as a replacement for the original OEM unit.

 

[Frenchy]

Presume your original is bust Scott ? very good chance the OEM is Bosch. ECP will have them at reasonable money.

 

[bmnelsc]

I don't know about changing one as preventative maintenance - I suppose one abused with leaded fuel, high ethanol fuel or low octane fuel could be reading incorrectly. Your MOT should show up any problems as your emissions will be out of range if your sensor is not working properly. As for after-market - I'd stick to the OEM sensor for a stock engine - you don't need to change them very often so why take a chance for a little difference... There are two "bungs" on my 91 S2 - one is for the sensor and the other is a test port (sorry - forget which is which). At my Pre Purchase Inspection, the dealer was unable to use the test port as the plug was siezed in so they took readings at the tail pipe (happily it was in spec) so they deemed the system to be operating correctly.

 

[Hilux]

I use these people.............very competitive for good quality (Bosch etc) If you cross reference part nos most are more generic than you would imagine. There are long and short pin types too. [link=http://www.lambda-sensors.co.uk/index.html]http://www.lambda-sensors.co.uk/index.html[/link]

 

[repsol]

if its not broke dont bother they can last forever mot smoke test will let you know when its broken if you dont have a gas tester