NTK O2 sensors
Thread Starter
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
NTK O2 sensors
I have a sensor starting to go bad. Its throwing a code intermittently. Its just the part that deals with how fast the cats heat up and the computer is seeing that the air injection is not sufficient. I just had a tune and they said its common to need sensors after changing headers. They were already going bad, but the difference from the headers pushed them over the line, is how they explained it I guess.
I am interested in the NGK's NTK line of O2 sensors. I want to replace both pre-cat sensors at once as they recommended. Does anyone have experience with them? They are part number 21006 and a direct replacement. I have always liked NGK parts and trust the name. I use their spark plugs too.
My other option is Bosch, which is a brand I have not been impressed with over the years. Both sensors are OEM replacement quality and seem good. Any info or experience would be nice. Maybe someone has had trouble with codes from a certain brand or something, I dont know. Just whatever may be helpful information. Thanks.
I am interested in the NGK's NTK line of O2 sensors. I want to replace both pre-cat sensors at once as they recommended. Does anyone have experience with them? They are part number 21006 and a direct replacement. I have always liked NGK parts and trust the name. I use their spark plugs too.
My other option is Bosch, which is a brand I have not been impressed with over the years. Both sensors are OEM replacement quality and seem good. Any info or experience would be nice. Maybe someone has had trouble with codes from a certain brand or something, I dont know. Just whatever may be helpful information. Thanks.
Thread Starter
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
Well I replaced both the front O2 sensors with the NTK ones. They worked great and are of good quality and a direct fit. I had no idea that O2 sensors are considered a maintenance item and should be replaced every 40k or 50k miles along with spark plugs and wires. They can bring back fuel economy and smooth the idle out much like new plugs. I recommend them to anyone in a higher mileage vette. 
Last edited by NukeC5; Jan 9, 2014 at 08:29 PM.
Race Director
Joined: Jan 2008
Posts: 16,028
Likes: 170
From: oregon
NTK and Denso, either one would be my 1st choice for any car. buy whichever of those 2 is cheaper.
i can't knock bosch o2's, just don't like the brand as much. their plugs aren't as good and o2's don't seem to last as long
o2's send a voltage feedback to the ecu which alters the short term fuel trim. if that signal becomes off from a sensor that just plain been exposed to hot exhaust gas for 10 years the signal won't be as accurate and your air/fuel suffers at part throttle
i can't knock bosch o2's, just don't like the brand as much. their plugs aren't as good and o2's don't seem to last as long
o2's send a voltage feedback to the ecu which alters the short term fuel trim. if that signal becomes off from a sensor that just plain been exposed to hot exhaust gas for 10 years the signal won't be as accurate and your air/fuel suffers at part throttle
Thread Starter
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
NTK and Denso, either one would be my 1st choice for any car. buy whichever of those 2 is cheaper.
i can't knock bosch o2's, just don't like the brand as much. their plugs aren't as good and o2's don't seem to last as long
o2's send a voltage feedback to the ecu which alters the short term fuel trim. if that signal becomes off from a sensor that just plain been exposed to hot exhaust gas for 10 years the signal won't be as accurate and your air/fuel suffers at part throttle
i can't knock bosch o2's, just don't like the brand as much. their plugs aren't as good and o2's don't seem to last as long
o2's send a voltage feedback to the ecu which alters the short term fuel trim. if that signal becomes off from a sensor that just plain been exposed to hot exhaust gas for 10 years the signal won't be as accurate and your air/fuel suffers at part throttle
Race Director
Joined: Mar 2001
Posts: 11,405
Likes: 26
From: Whippany NJ
CI 6-7-8-9 Veteran
St. Jude Donor '08-'09
NCM Sinkhole Donor
Well I replaced both the front O2 sensors with the NTK ones. They worked great and are of good quality and a direct fit. I had no idea that O2 sensors are considered a maintenance item and should be replaced every 40 or 50 miles along with spark plugs and wires. They can bring back fuel economy and smooth the idle out much like new plugs. I recommend them to anyone in a higher mileage vette.
Last edited by Ikester; Sep 15, 2012 at 08:10 AM.
Thread Starter
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
I ended up doing all the sensors just for maintenance. The NTK's were really good quality and went in great. They took care of my trouble code and everything has been great since.
Safety Car
Joined: Jul 2011
Posts: 3,641
Likes: 6
From: Easley SC
The Bosch is what came in your car from the factory. I've had good luck with them as replacements also
http://www.bosch-press.com/tbwebdb/b...earch=0&id=337
The oxygen sensor, which was first developed by Bosch more than 30 years ago, is one example of the many Bosch products that reflect the company’s slogan of Invented for Life. Bosch oxygen sensors, which are supplied to virtually every automaker in the world, are an integral part of the engine management system and allow achievement of strict emission requirements and increasing fuel economy standards, while not sacrificing powertrain performance.
http://www.bosch-press.com/tbwebdb/b...earch=0&id=337
The oxygen sensor, which was first developed by Bosch more than 30 years ago, is one example of the many Bosch products that reflect the company’s slogan of Invented for Life. Bosch oxygen sensors, which are supplied to virtually every automaker in the world, are an integral part of the engine management system and allow achievement of strict emission requirements and increasing fuel economy standards, while not sacrificing powertrain performance.
Last edited by gotz06?; Sep 8, 2012 at 02:21 PM.
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Thread Starter
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
If you are into the NGK's NTK line I have nothing but good things to say about them. The parts just look higher quality as well. I've been using NGK spark plugs and wires for years. Love the brand and I'm glad they make the 02 sensors too.
The part number for the shorter front sensors are: 21006, and for the longer rear sensors: 21537
I got them on ebay for pretty cheap. Even summit racing was almost double in price for them. (Corvette Tax!!! Look out!!!)
Safety Car
Joined: May 2007
Posts: 4,812
Likes: 46
From: Taylorsville North Carolina
I have been getting the P0133 code forever. I have LTs with the rears moved to the front and the rears tuned out. What brand/part #s did you get and from where? Interested in seeing what your datalog says. I recently got an obdII reader and the O2 readings are confusing to me. Just curious what to be looking for there. TIA.
Instructor
Joined: Nov 2006
Posts: 100
Likes: 0
Denso OE 02 Sensors
Hi,
I purchased the following parts last winter 2 x Part#234-4104 = $119.90
and 2 x Part#234-4668 = $84.20, these parts were excellent value and quality, installation was easy and no problems since.
2004 Corvette Z06
from sales@monarchproductsinc.com
TEL 951-672 8501
I purchased the following parts last winter 2 x Part#234-4104 = $119.90
and 2 x Part#234-4668 = $84.20, these parts were excellent value and quality, installation was easy and no problems since.
2004 Corvette Z06
from sales@monarchproductsinc.com
TEL 951-672 8501
Melting Slicks
Joined: Mar 2006
Posts: 2,754
Likes: 380
From: South Florida FL
I have been getting the P0133 code forever. I have LTs with the rears moved to the front and the rears tuned out. What brand/part #s did you get and from where? Interested in seeing what your datalog says. I recently got an obdII reader and the O2 readings are confusing to me. Just curious what to be looking for there. TIA.
,P0153 - Slow Response Bank 2 Sensor 1, i got them off the auction site
brand/part number NTK 21537. those are the longer rear sensors.
I wouldn't to install/log till Sun-Mon, i shall return
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
I was fouling out the Passenger side "ONLY" on mine and the Original AC Delco AFS 75 (GM 19178930) were still in there with 100,000+ miles on the O2 Sensors themselves -
Realize that you can even have one go bad without receiving a O2 sensor code!!! (I and others have had this happen)
Plus they have 735 RWHP Supercharged miles with Methanol Injection on them too!
I just put in the 2 new Front AC Delco AFS 75(GM 19178930) (I took pictures and will post them later this evening, these are a New and Improved design as well, instead of slices in the sensor tip they have holes around it instead) -
I will test drive it later today and get back to you on the difference!
Pictures:
New Style O2 Sensors AcDelco -
Old Sensors (AcDelco AFS 75) Passenger Side on RIGHT in Picture (100,000+ Miles on the Original O2 Sensors)
Thanks,Matt
Realize that you can even have one go bad without receiving a O2 sensor code!!! (I and others have had this happen)
Plus they have 735 RWHP Supercharged miles with Methanol Injection on them too!
I just put in the 2 new Front AC Delco AFS 75(GM 19178930) (I took pictures and will post them later this evening, these are a New and Improved design as well, instead of slices in the sensor tip they have holes around it instead) -
I will test drive it later today and get back to you on the difference!
Pictures:
New Style O2 Sensors AcDelco -
Old Sensors (AcDelco AFS 75) Passenger Side on RIGHT in Picture (100,000+ Miles on the Original O2 Sensors)
Thanks,Matt
Last edited by madmatt9471; Sep 15, 2012 at 09:55 PM.
Thread Starter
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
I was fouling out the Passenger side "ONLY" on mine and the Original AC Delco AFS 75 (GM 19178930) were still in there with 100,000+ miles on the O2 Sensors themselves -
Realize that you can even have one go bad without receiving a O2 sensor code!!! (I and others have had this happen)
Plus they have 735 RWHP Supercharged miles with Methanol Injection on them too!
I just put in the 2 new Front AC Delco AFS 75(GM 19178930) (I took pictures and will post them later this evening, these are a New and Improved design as well, instead of slices in the sensor tip they have holes around it instead) -
I will test drive it later today and get back to you on the difference!
Thanks,Matt
Realize that you can even have one go bad without receiving a O2 sensor code!!! (I and others have had this happen)
Plus they have 735 RWHP Supercharged miles with Methanol Injection on them too!
I just put in the 2 new Front AC Delco AFS 75(GM 19178930) (I took pictures and will post them later this evening, these are a New and Improved design as well, instead of slices in the sensor tip they have holes around it instead) -
I will test drive it later today and get back to you on the difference!
Thanks,Matt
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
They definitely seem better and I can't wait to take it out in a while to see how much better or "IF" it indeed did fix the rich condition on my passenger side! This has happened to other fella's too and it turns out to be the O2 taking a dump or burnt to exhaust wires 
Pictures:
New Style O2 Sensors AcDelco -
Old Sensors (AcDelco AFS 75) Passenger Side on RIGHT in Picture (100,000+ Miles on the Original O2 Sensors)
Thanks,Matt
Last edited by madmatt9471; Sep 15, 2012 at 09:54 PM.
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Well, so far all has went well on the test drive with the 2 new AC Delco AFS 75(GM 19178930) O2 Sensors
At the point of driving it surely would have loaded up at the stop light and under cruising conditions, it was perfect!
Pictures:
New Style O2 Sensors AcDelco -
Old Sensors (AcDelco AFS 75) Passenger Side on RIGHT in Picture (100,000+ Miles on the Original O2 Sensors)
Thanks,Matt
At the point of driving it surely would have loaded up at the stop light and under cruising conditions, it was perfect!
Pictures:
New Style O2 Sensors AcDelco -
Old Sensors (AcDelco AFS 75) Passenger Side on RIGHT in Picture (100,000+ Miles on the Original O2 Sensors)
Thanks,Matt
Last edited by madmatt9471; Sep 15, 2012 at 09:54 PM.
Race Director
Joined: Jan 2008
Posts: 16,028
Likes: 170
From: oregon
I was fouling out the Passenger side "ONLY" on mine and the Original AC Delco AFS 75 (GM 19178930) were still in there with 100,000+ miles on the O2 Sensors themselves -
Realize that you can even have one go bad without receiving a O2 sensor code!!! (I and others have had this happen)
Plus they have 735 RWHP Supercharged miles with Methanol Injection on them too!
I just put in the 2 new Front AC Delco AFS 75(GM 19178930) (I took pictures and will post them later this evening, these are a New and Improved design as well, instead of slices in the sensor tip they have holes around it instead) -
I will test drive it later today and get back to you on the difference!
Thanks,Matt
Realize that you can even have one go bad without receiving a O2 sensor code!!! (I and others have had this happen)
Plus they have 735 RWHP Supercharged miles with Methanol Injection on them too!
I just put in the 2 new Front AC Delco AFS 75(GM 19178930) (I took pictures and will post them later this evening, these are a New and Improved design as well, instead of slices in the sensor tip they have holes around it instead) -
I will test drive it later today and get back to you on the difference!
Thanks,Matt
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Pictures:
New Style O2 Sensors AcDelco -
Old Sensors (AcDelco AFS 75) Passenger Side on RIGHT in Picture (100,000+ Miles on the Original O2 Sensors)
Thanks,Matt
New Style O2 Sensors AcDelco -
Old Sensors (AcDelco AFS 75) Passenger Side on RIGHT in Picture (100,000+ Miles on the Original O2 Sensors)
Thanks,Matt