O2 Sensor Info
Thread Starter
VETERAN
Joined: Oct 2015
Posts: 592
Likes: 57
From: Dayton OH
2025 C5 of the Year Finalist - Unmodified
O2 Sensor Info
Since I can't get an answer on my other question let me post this:
Should the O2 sensor readouts be the same for the upstream sensors, ie, 44-45 on both sensors ??
What if your left O2 sensor was reading all over the place or jumping in value, 22-77-34-56 ?
Is that O2 sensor BAD ??
Thanks,
Jim
Should the O2 sensor readouts be the same for the upstream sensors, ie, 44-45 on both sensors ??
What if your left O2 sensor was reading all over the place or jumping in value, 22-77-34-56 ?
Is that O2 sensor BAD ??
Thanks,
Jim
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 326
From: CA.
St. Jude Donor '13-'14-'15
1st you need to use a scanning device that read data in "real time"
While the engine is running the front 02 voltages should be changing or oscillating rapidly from like .150 to .950 milivolts -- --The average 02 voltages should be like from .400 to .500 milivolts---- IF the 02 voltages are flatlined on any number (normally .450) this means that it is DEAD---and should be replaced----
02 sensors are like spark plugs once they get fouled--they are junk -Another issue with LT headers is that both will change slowly--This is a whole other topic
PS If both seem to be changing rapidly yet the AVERAGE voltages from left to right seems to be alot---- The cause of this issue is most often an exhaust leak-----The side with the LOWER average voltage is the side with the leak---
While the engine is running the front 02 voltages should be changing or oscillating rapidly from like .150 to .950 milivolts -- --The average 02 voltages should be like from .400 to .500 milivolts---- IF the 02 voltages are flatlined on any number (normally .450) this means that it is DEAD---and should be replaced----
02 sensors are like spark plugs once they get fouled--they are junk -Another issue with LT headers is that both will change slowly--This is a whole other topic
PS If both seem to be changing rapidly yet the AVERAGE voltages from left to right seems to be alot---- The cause of this issue is most often an exhaust leak-----The side with the LOWER average voltage is the side with the leak---
Thread Starter
VETERAN
Joined: Oct 2015
Posts: 592
Likes: 57
From: Dayton OH
2025 C5 of the Year Finalist - Unmodified
1st you need to use a scanning device that read data in "real time"
While the engine is running the front 02 voltages should be changing or oscillating rapidly from like .150 to .950 milivolts -- --The average 02 voltages should be like from .400 to .500 milivolts---- IF the 02 voltages are flatlined on any number (normally .450) this means that it is DEAD---and should be replaced----
02 sensors are like spark plugs once they get fouled--they are junk -Another issue with LT headers is that both will change slowly--This is a whole other topic
PS If both seem to be changing rapidly yet the AVERAGE voltages from left to right seems to be alot---- The cause of this issue is most often an exhaust leak-----The side with the LOWER average voltage is the side with the leak---
While the engine is running the front 02 voltages should be changing or oscillating rapidly from like .150 to .950 milivolts -- --The average 02 voltages should be like from .400 to .500 milivolts---- IF the 02 voltages are flatlined on any number (normally .450) this means that it is DEAD---and should be replaced----
02 sensors are like spark plugs once they get fouled--they are junk -Another issue with LT headers is that both will change slowly--This is a whole other topic
PS If both seem to be changing rapidly yet the AVERAGE voltages from left to right seems to be alot---- The cause of this issue is most often an exhaust leak-----The side with the LOWER average voltage is the side with the leak---
