PO-135 O2 Sensor? [Archive] - GrandAmGT.com Forum


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04-17-2009, 02:43 PM
I've got an SES on a 2001 GAGT (LA1 V6), and after getting it scanned at AutoZone it's this O2 sensor error. Is it easy enough to get at for a DIY job? Or would I be better off going to a shop? (I don't have any good way to get under the car here.)

04-17-2009, 02:50 PM
you dont need to get under the car as this code is for the primary (before the cat) o2 sensor.. you will however need an o2 sensor removal tool and a ratchet that will work with it.

seeing as that you are in waukegan if you wanted to bring the car to me here in Round Lake I would be happy to change the sensor for you. cost is $35+ the cost of the new sensor

04-17-2009, 02:55 PM
just be sure to get the (sadly much more expensive) pre cat o2 sensor and not the post cat one.

new O2's go for about 80-100 bucks depending on brand and where you buy from

05-03-2009, 02:23 PM
Thanks for the tips. I believe I still have an O2 socket somewhere (hard to miss with the big notch out of the side allowing for the wire. Now if they come in more than one size... I don't recall that though.) It's just that I haven't messed under the hood much since my ol' Skylark with a LD2 Quad 4. It had more quirks in some aspects, but at least I had some room to work with and could see where stuff is and get at it. LA1 V6 is a bit of a different beast in that regard. (Thank goodness that it's been more reliable, post LIM replacement.)

Ok, following the advice concerning accessability I went looking for it. It's tucked a bit back and underneath near the firewall as viewed from the passenger side but with enough space around it so nothing else needs to come out. But now I traced out the wire where it heads towards the alternator, to find a blue clip with a connector that doubles back to a wiring loom going the other way towards the driver's side. The thing is, I noticed the connector is at quite an awkward angle and the wire there may be exposed. So it may be an electrical problem and not a sensor one. I think the break (if that's what I'm feeling) is on the base of the connector that is supposed to stay with the car. Would you mind checking that before I buy a new sensor, and have you got a tool for fixing that?

http://img14.imageshack.us/img14/2752/gala1v6o21.th.jpg (http://img14.imageshack.us/my.php?image=gala1v6o21.jpg)
There it is. Not too different from where I remember finding these things in my previous car. Just tucked in behind a bit more stuff and is viewed from the passenger side. Hard to miss an electrical plug looking thing attached to the exhaust.

http://img14.imageshack.us/img14/4213/gala1v6o22.th.jpg (http://img14.imageshack.us/my.php?image=gala1v6o22.jpg)
I had trouble getting the whole thing in a camera shot, but this is where I traced the wire to. It feels like there may be a break because there's a really sharp bend in one of the wires before it goes into a loom. Previous experience tells me: sharp bends + wiring = trouble.