well this is not good news for me.​​​​😞
​​​ I had a tuneup done on my vehicle, wouldn’t the mechanic picked up on the cylinders misfiring? Also, when I had it inspected, and it failed, would the cylinder not have showed up on that?
any suggestions now? Please and thank you.

 

> any suggestions now?

Four bad O2 sensors and two bad PUP converters are not random failure. I sense these are all symptoms of some undiagnosed engine issue. I think you now have a problerm that exceeds DIY repair. If your Tracker would otherwise pass inspection (no frame rust, etc.) and runs good otherwise, I would call Mrs. O. at South Main Auto in Avoca and make an appointment to have Eric diagnose your car. You need a professional and this guy is famous for his skill, honesty and fair pricing. People drag their cars from three states away to have him fix them. Other shops bring him cars they can't fix. This guy is the real deal. If I lived anywhere in the NY area I'd be on the phone this afternoon.

 

I thought it was a good idea to replace all four of the sensors at the same time.
I’m trying to diagnose the repair myself.
Yes, I agree should get a professional to look at it. And Avoca, New York is about 4 1/2 hours away from me. I hope Mrs. O has a place for me to crash while my Tracker is getting looked at 😁

 

People from out of state stay at the local motel but you could have someone follow you and drop the car off. It could take a few days to get parts. Also Eric can do the state inspection for you.

 

No lift req’d but I would roll the vehicle up onto a flat block or something just to give you a little elbow room.
Set emergency brake, of course.
Buy the O2 sensors locally. Believe it or not, the wiring harnesses are different. Some do not have the retaining clip and they are shorter. They will still work but...
if you get one that is not quite right, you can take it back for an easy exchange.
When you get the new sensor, you can see how the locking clip is designed so a proper squeeze in the right place will make for an easy release.

 

The O2 sensors produce very specific indicators to an OBD2 code reader or to a scope. Any decent mechanic could read it and tell you which ones are failing. The O2 sensor are a factory recommended change item at 100k miles. Of course you can do better. But if one is failing, it shouldn’t be long before the others quit too.
Four O2 sensors will cost close to $300...for the parts.
Worse case, the converter/manifold will cost $400 each...for the parts.
Add in the labor and it may be time to decide how much you really like this Tracker.

 

> The O2 sensor are a factory recommended change item at 100k miles.

The maintenance schedule in my Tracker's factory service manual never calls for routine O2 sensor replacement.

 

You can buy all four O2 sensors (Bosch) from O’Reilly Auto Parts or Autozone for about $300. A mechanic could swap all four in about one hour. So YOU do the math.
If you have to pay for all the the parts AND labor, I believe you are going to put $2000 into a $4000 vehicle.
It may be time to part ways with your beloved Tracker. 🙄

Let us know what the MILEAGE is on your Tracker.
If it’s more than 160k-180k miles, it’s going to turn into a money pit.
Example: Have you looked at your CV axle boots? Are they torn and leaking?
THAT is a $300 fix for EACH side.
It all starts to add up for an older vehicle. 🙄

 

You’re right. It’s not in my service manual either.
But I know I read it from a GM source somewhere because it caught me by surprise.
Now I will have to go find the source. I don’t want to be a source of bad intel for maintenance.
Thanks.

 

> I don’t want to be a source of bad intel
Me either. I have googled this topic with mixed results but I'm leaning this way:

When Should You Replace Your O2 Sensor?

Oxygen sensors are not among the maintenance items that need to be replaced regularly, such as oil and air filters, so they typically are replaced only when they fail.

https://www.cars.com/articles/when-s...1420663031800/