Hi folks, this is my 1st post.

After reading some suggestions here, and becoming more knowledgeable, I have solved the problems. Bank * Sensor * heater malfunction.

1. If you have a sensor that reads O ohms between pinout 3 and 4. The sensor is faulty replace it.
If you have a reading around 3 to 5 ohms, sensor is salvageable. (Should be above 10 ohms when engine is cold)
2. With ignition ON there should be 12 v between pinout 1 to body ground and around 4.v between pinout 2 and body ground with the engine cold

With my readings S1 3.4 ohms and S2 reading.of 5.6 ohms. I was getting those codes P0135 P0141

To make a long story short, I spliced one of the white wires on the sensors and began trying different resistances in series on the wire, after some trial and error with different resistances. I finally hit the sweet spot. I used 51 ohm 2w resistors. So, I connected 3 x 51ohm 2w resistors in parallel, (giving me around 12.6 ohms at 6.w) in series on the spliced wires. The reading climbed to S1 15.6 ohm and S2 to 18 ohms. The engine loved it. Codes cleared on their own. The engine's power is back. This took me about a week to figure out. Finally success!.Note the engine is running leaner from cold start-up so it need to warm up a bit before driving, else it bogs down with a light accelerator input. I hope this helps some civic owners having this same issue. BTW I have a D15B MPFI VTEC engine rated at 130 HP at 6,800 rpm replacing the original D17A2 MPFI VTEC. This D15B, (no suffixes) looks identical to the D17A2 engine.
update: I drove it today for the first time after fixing it last night. I'm loving it.
​​​
CHEERS
​​