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Discussion Starter · #1 · (Edited)
I have a spare O2 sensor that was used - upstream.

Is there a way to check if its good?
NTK 24169 - Am I correct that this is the one get changed mostly relating to emission?
My car is not throwing any code.
Nothing weird either
 

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Discussion Starter · #3 ·
Thanks @jjkz24

Where is actually the MAF or MAP sensor on my 1999 Integra LS Auto?

My car is keep failing emission - last time on 25mph and this time on 15mph. It runs perfectly making it hard.
 

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Discussion Starter · #6 · (Edited)
MAP sensor is on top of your throttle body. Integras do not have MAF (mass air-flow) sensors
I got some live stream data while the car was running:

At 2k rpm:
  • O2 sensor output voltage-B1S2 = 0.095 - Low?
  • O2 sensor output voltage-B1S1 = 0.210 (replaced in 2016)
  • Ignition timing advance for #1 cylinder= 33.5 BTDC - high?

At 800 rpm:
  • O2 sensor output voltage-B1S2 = 0.015 - Low?
  • O2 sensor output voltage-B1S1 = 0.115 (replaced in 2016)
  • Ignition timing advance for #1 cylinder= 15 BTDC
manifold absolute pressure sensor = 4.64

When I drive, the downstream O2 sensor fluctuate between 0.02 - 0.88 volts!

Anything obvious?
 

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Discussion Starter · #7 ·
What should be the Fuel Trim mixture?
Short Term Fuel Trim - Bank1 = 14.8 - 7.0%
Short Term Fuel Trim B1S1 = 12.5- 4.7%
Short Term Fuel Trim B1S2 = 7.8 - 11.7%

Long Term Fuel Trim - Bank1 = 5.47%
 

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Discussion Starter · #8 ·
Well I checked for O2 sensor functionality on the installed O2 sensor at lean condition.

I disconnected the PCV and O2 voltage stopped fluctuating and fell below 0.1 volt - I didn’t bother checking for Rich condition given its NTK part that was replaced in 2016
< https://dannysengineportal.com/o2-oxygen-sensor-function-failure-symptoms-testing/>

Also cleaned the MAP sensor.
I found the bad PCV valve - its only 2 yrs old! Replaced.
 
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