O2 sensor woes. Please help!
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O2 sensor woes. Please help!
Hi,
i’ve Been getting crappy mileage - 25mpg with my 1996 civic hx. It has manual transmission from the Cx I used to own. It used to get closer to 40-45 mpg. No crack in manifold since it was replaced, and the cat does not appear to be clogged after checking with pressure gauge.
recebtly went to replace the o2 sensor, and did all the research. Discovered that it *must* be an NGK/NTK 24300. So i go on the big evil amazon and find one for amazing price of $165. Get it, put it in (though I forgot to pull the battery negative), started up the car, and it drove fine... for about 10-15 miles. The check engine light came on. I happened to have obdii reader plugged in at the time, so I pulled over, reset the code that had come up (p1164 - lean condition), and went on my way. Shortly thereafter the car started hesitating around the point where the Vtec solenoid kicks in. I managed to get to my destination with the car in 3rd gear and engine revving above 3100 rpms, with no more hesitating, but any time I shift to lower gear and it gets down below vtec engagement point, STFT numbers would go apeshit (-23 or more), and car would hesitate and skip, until I let off the gas for a second and shifted back into higher gear with engine revving above 3000.
when I got home, I pulled the sensor and found that it is marked LZA08-J2, which according to oxygensensor.net is actually an NTK 24302 Sensor and not the 24300. The box I got the sensor in had a sticker on it claiming it was a 24300, was a real NTK box, but underneath the sticker is another sticker that says 24266. The sensor also has what look like splices in the cables, which make me question if someone re-wired the Lza08-j2 onto the correct harness for the 24300 sensor (or are these two connectors the same???) the 24300 cross references with lza09-e1, which is not the same.
What is the difference between the 24300 and the 24302? Both are 5 wire ntk wideband o2 sensors.
anyway, I’m gonna put the old sensor back in and see if the car drives better again, and order the correct sensor from oxygensensor.net unless y’all can tell me somewhere better to buy one. Hopefully amazon takes the shady mislabeled part back.
i’ve Been getting crappy mileage - 25mpg with my 1996 civic hx. It has manual transmission from the Cx I used to own. It used to get closer to 40-45 mpg. No crack in manifold since it was replaced, and the cat does not appear to be clogged after checking with pressure gauge.
recebtly went to replace the o2 sensor, and did all the research. Discovered that it *must* be an NGK/NTK 24300. So i go on the big evil amazon and find one for amazing price of $165. Get it, put it in (though I forgot to pull the battery negative), started up the car, and it drove fine... for about 10-15 miles. The check engine light came on. I happened to have obdii reader plugged in at the time, so I pulled over, reset the code that had come up (p1164 - lean condition), and went on my way. Shortly thereafter the car started hesitating around the point where the Vtec solenoid kicks in. I managed to get to my destination with the car in 3rd gear and engine revving above 3100 rpms, with no more hesitating, but any time I shift to lower gear and it gets down below vtec engagement point, STFT numbers would go apeshit (-23 or more), and car would hesitate and skip, until I let off the gas for a second and shifted back into higher gear with engine revving above 3000.
when I got home, I pulled the sensor and found that it is marked LZA08-J2, which according to oxygensensor.net is actually an NTK 24302 Sensor and not the 24300. The box I got the sensor in had a sticker on it claiming it was a 24300, was a real NTK box, but underneath the sticker is another sticker that says 24266. The sensor also has what look like splices in the cables, which make me question if someone re-wired the Lza08-j2 onto the correct harness for the 24300 sensor (or are these two connectors the same???) the 24300 cross references with lza09-e1, which is not the same.
What is the difference between the 24300 and the 24302? Both are 5 wire ntk wideband o2 sensors.
anyway, I’m gonna put the old sensor back in and see if the car drives better again, and order the correct sensor from oxygensensor.net unless y’all can tell me somewhere better to buy one. Hopefully amazon takes the shady mislabeled part back.
Last edited by hx1996; Oct 20, 2018 at 11:34 AM. Reason: Added info
Thread Starter
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Re: O2 sensor woes. Please help!
the car definitely drives better with the original O2 sensor, though even driving on the highway, verifying that lean burn is engaged by the second O2 sensor going to zero, the LT fuel trim is still jacked, up, and made its way up to 4.7 after a 20 minute cruise on the highway. My understanding was that as the sensor fails, the computer will automatically enrich the fuel mix to compensate, and it seems this is why my MPG are so poor. I changed spark plugs, and the old ones were burned away, but not terribly. they where white/brown, indicating to me that it wasn't burning *that* rich. did compression test and got 170-180 on each cylinder. Next step is changing the fuel filter out, and see if that helps, since it's long overdue.
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From: chicago burbs, Il, USA
Re: O2 sensor woes. Please help!
The sensor also has what look like splices in the cables,
the VX and HX rely on the O2 heavily, it has to be right or the car will run like crap.
**edit**
after a quick google...
24300 is the stock L1H1 replacement
24302 has a slightly different current requirement for the charge pump (simple terms, it will not work right with an ECU designed for the L1H1)
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