Wideband O2 Sensor On Stock ECU
 

My FD is running pig rich right now and I want to replace the o2 sensor.

I have a wideband that also does a narrow band output. Has anyone ran a NB output to their stock ECU and had it function correctly? I know the WB output is a linear voltage from 0-5 and I think stock NBs have a functional range of a fraction of a volt. Does anyone know if the NB output is linear accross the 1V or is just a portion like the stock sensor?

Thanks,
Zach

If the wideband has a true narrow band it will function just like the stock sensor. But it would be pointless to run the wideband because you can't change anything with the stock ecu. You can buy a bosch sensor from an auto parts store for like 25. Hell i have one with like 20 miles on it i'll sell for 15 shipped.

It is coming off a car I'm parting out with a haltech on it which I'm going to move over shortly. So I either move the WB now or I wait. This way, I'll at least be able to monitor my A:F which can help me determine some of the problems I'm having. It doesn't seem pointless. Overkill maybe, but far from pointless.

It is a PLX M300 so the the output looks like it behaves like most narrow bands using a small voltage range.

I found exactly one person that said anything about doing this and they said it caused a problem for them. It doesn't seem like it should so I'm looking for feedback.

I'm not familiar with that wideband in particular but if it advertises a narrowband output there shouldn't be a problem. You're right it would be nice to at least monitor the af ratios. And since you already have the wideband and have future plans with the ecu then yeah def not pointless.

Well since you're the only person that has anything to say about this I think I'm just going to dive in and give it a try. Thanks for the input.

My 2 cents -

Most widebands can simulate a narrowband output so they can be used in lieu of a 0-1v O2 sensor. Sometimes, this simulation works well, sometimes it results in jerky response and just doesn't run smooth.

My issue would be the location of the wideband. If you put a wideband sensor in the downpipe in the stock O2 location (ie, right off the turbo outlet) it's gonna run the wideband VERY hot. You'll likely get signal errors, and it's possible the wideband will have a short life. I have my wideband mounted at the tail end of the downpipe, works great there.

If you just need to get a regular O2 sensor in there to run temporarily, get on the For Sale forum and see if someone has a cheap stock O2 sensor to sell you - I bet someone does.

I would definitely get the car running RIGHT before moving the Haltech into it. I always recommend that a car be running in top shape before any mods, and especially a fuel computer, are added. Trying to troubleshoot the problem with a full Haltech install on top of it will be VERY hard.

Have you checked for ECU codes? There's a number of things that can make the car run super rich.

Dale

The stock sensor location is very close to the turbos and is not a good location for a wideband sensor:

http://www.techedge.com.au/vehicle/wbo2/default.htm

[Edit: Dale beat me to it on the location issue.]

I fully intend to resolve my issues prior to switching to the wideband.

I checked the ECU codes when the car first started and found there was a double throttle code and found that the plug was slightly loose so I fixed it, no other codes at that time. I will check them again.

I'll spend the money on a decent one for the time being. If I'm not getting a code for it, should I still consider replacing it?

Thanks for the posts guys.