By following the instrustion from http://www.c-speedracing.com/faq.php
the signal I read from the flashing CEL is 1 (short), which means:

"Oxygen Sensor "A" (Primary) defective circuit or unplugged / defective sensor"

So, what can I try to do other before getting a new O2 sensor?

Note: Washed engine bay about 5 days ago then sat in the garage, started the car today and it ran fine for the day, then CEL came on tonight. Reset ECU, CEL came back on after idle for 3 mins. Car runs fine with the VTEC came on like normal.

Q2: I was checking the CEL code and noticed the ABS light kept flashing. Based on the same "rules" apply for CEL code, what I read from ABS light was 8-long-1-short (81?) and 1-short-6-long (16?) what does that mean?

TIA

 

you should be able to check the voltage from the o2 sensor to see if its working properly. i dont know the exact details of this tho, just figured id throw it out there as a suggestion

 

What year/car?? O2 sensor circuits probably don't all go the the same pins on the ECU. Plus, I think even the ABS error codes changed over the years. For some reason they list the ABS codes as hyphenated. So you've got 8-1 & 1-6.

You can find which wire on your O2 sensor is the signal, make sure it's got good continuity back to the proper pin on the ECU. Also make sure it isn't shorted to ground somewhere. There's also a ground wire for the sensor, verify it's OK.

With the engine running & the sensor plugged in, the O2 sensor signal should swing rapidly up & down between about 0.1v & 0.9v. You can measure that in the backside of the plug on the ECU, once you know which pin.

 

oh... I missed that part, it's a 01 ITR.