Recommendations on some good O2 sensors?

[pgarland]

Looking for some O.E. O2 sensors for my 420A, but not a huge fan of Bosch. The Denso ones look pretty reasonably priced on autozone.com, but I haven't had any sort of experience with these (durability, longevity, etc.). I guess what I'm asking is if anyone here knows a good place to get a good, reliable set of O2 Sensors (upstream and downstream...my car is throwing codes for both of them) for a good price?

Also, on a side note, I know the O2 sensors send readings (by way of voltage) back to the ECU, but would a bad or failing O2 sensor cause the motor to lose fuel economy or stall out occasionally? At the risk of sounding like a complete idiot here, I am under the impression that the sensor's readings cause the ECU to adjust air/fuel ratio, and that a bad O2 sensor could cause an improper air/fuel ratio situation to happen (i.e. the sensor is reading the oxygen level wrong, therefore adds more fuel to compensate, causing the motor to run rich, and the car to lose fuel economy). I've been getting much worse fuel economy since my car started throwing the codes, am I on the right track in thinking that simply replacing the sensors will help to bring my fuel economy back, and stop my car from stalling randomly (it only stalls once in awhile, and only when I'm braking hard).

Any help is appreciated. Thanks in advance.

 

[Shake_Zulla]

Looking for some O.E. O2 sensors for my 420A, but not a huge fan of Bosch. The Denso ones look pretty reasonably priced on autozone.com, but I haven't had any sort of experience with these (durability, longevity, etc.). I guess what I'm asking is if anyone here knows a good place to get a good, reliable set of O2 Sensors (upstream and downstream...my car is throwing codes for both of them) for a good price?

Also, on a side note, I know the O2 sensors send readings (by way of voltage) back to the ECU, but would a bad or failing O2 sensor cause the motor to lose fuel economy or stall out occasionally? At the risk of sounding like a complete idiot here, I am under the impression that the sensor's readings cause the ECU to adjust air/fuel ratio, and that a bad O2 sensor could cause an improper air/fuel ratio situation to happen (i.e. the sensor is reading the oxygen level wrong, therefore adds more fuel to compensate, causing the motor to run rich, and the car to lose fuel economy). I've been getting much worse fuel economy since my car started throwing the codes, am I on the right track in thinking that simply replacing the sensors will help to bring my fuel economy back, and stop my car from stalling randomly (it only stalls once in awhile, and only when I'm braking hard).

Any help is appreciated. Thanks in advance.

Yeah but I havn't heard of a car stalling because of just the O2 but I guess its possible. Might want to do the key dance to see what codes are popping up.

 

[pgarland]

Yeah but I havn't heard of a car stalling because of just the O2 but I guess its possible. Might want to do the key dance to see what codes are popping up.

I have access to an OBD-II scanner...the codes are definitely upstream and downstream O2 sensors (specifically bank 1 and bank 2 oxygen sensor malfunction, which translates to upstream and downstream O2 sensors since the 420a only has 2 oxygen sensors). I don't remember the specific code numbers off hand (PO134 I think was one of them...but don't quote me on the number, it's been a few days and I didn't write the numbers down when I scanned it) but I am 100% certain that the codes were for both O2 sensors - looked it up in the book and through the DTC database (didn't write the code numbers down, just the information the DTC database, the manual, and the OBD-II book gave me). I'm also about 99.9% positive the O2 sensors are causing me all the trouble, as I recently replaced the motor with a new 420A ("new" meaning low mileage and warrantied...only had 34,000 miles on it, and I also had the timing belt, tensioners, EGR, and throttle body replaced at the same time). What I didn't have changed out when the new motor went in was the old O2 sensors...that's what I'm looking to do now (I also want to replace the IAC and a few other miscellaneous sensors as well...but one thing at a time). All this basic maintenance needs to get done before I start down the upgrade path...no sense dumping money into go-fast parts until this car is 100% reliable as a DD first, right?

As far as the "stalling" goes, I may have given the wrong impression in my first post...the car doesn't actually stall unless I'm braking hard, and even then it doesn't really "stall" persay, the motor sputters and acts like it wants to shut off, but fires right back up the moment I let off the brake pedal (when it happens it is almost instantaneous, like within a half a second or so, then the motor hits normal idle and runs fine).

Anybody got any recommendations on some reasonably priced, high quality O2 sensors?

Thanks Shake_Zulla for the reply...I figured that the bad sensors would affect my fuel economy, but wanted a second opinion on it.

 

[Boostinsideways]

Denso and Bosch are both good brands. Running rich will kill either fairly quickly.

 

['97boostinGST]

Denso is the supplier to the OEM ones if i'm not mistaken.

www.oxygensensors.com

 

[pgarland]

Denso is the supplier to the OEM ones if i'm not mistaken.

OxygenSensors.com

Thanks, that's exactly what I was looking for. Going with the Denso's...Thanks all for the replies.