This must be O2 sensor week

[captngaryr]

Last night I got a MIL. This morning I jumpered the OBDI (blue) plug and counted a code 66 (equivalent to a P0141, I think). It is listed as a Rear Secondary Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 2. Any suggestions? Is this simply a bad sensor, or have people seen a problem with the ECM or wiring that drives the heater? Where should I get a new sensor? I seem to recall that there are more economical places to get the sensor than Honda.

TIA,
Gary

 

[Larry Bastanza]

Change the rear secondary 02 sensor(after the cat).....

 

[ftuhy]

Gary,
I should have read this before your thread on ODBII readers. Anyway, the generation O2 sensors on our NSXs have a sensor and a heater. The heater warms the sensor up so that it gets into its good operating range more quickly. If the heater blows, then it takes longer ( a few more minuites, perhaps) for the engine to get into its ideal, low polution, more efficient operating range.

You can buy sensors for far below the $300 or higher cost from Acura/Honda. Denso & another Japanese CO (I forgot - do a quick search) were the OEM suppliers & you can get them in the $40 range with a generic cable length, or in the $80 range for the specific cable length and connector for your NSX. In a bit of blasphmemy, my old '95 Ford Taurus used an Autolite O2 sensor that is cross-referenced for the Denso generic part number for the NSX. So far, the heaters have blown on 2 sensors in my NSX in 50kmi. I never lost one in the Taurus in 180kmi while I owned it.

Rock Auto (http://www.rockauto.com/catalog/) is one of my favorite non-Honda parts places and they have Denso sensors for the NSX ($30 - $60 range). I'd start there or do a search on Prime for other suppliers.

 

[BobMc]

Gary
I have some O2 sockets if you need them. They can be stubborn getting them out.
Bob

 

[captngaryr]

Change the front secondary 02 sensor(after the cat).....

Hi Larry,
I'm more than a little confused. My OBD says rear secondary. I assume that means it is the second sensor off the rear cylinder bank. The first sensor in in the header (Cantrell) and the second sensor is in the cat itself. Therefore I assume I change the sensor in the cat. No? I hope I didn't order the wrong sensor!

Gary

- - - Updated - - -

Gary
I have some O2 sockets if you need them. They can be stubborn getting them out.
Bob

Hi Bob,
Good to hear from you. I have already ordered the sensor (hopefully the right one) and the wrench. Of course after I ordered the wrench, I decided to put some PB Blaster on the sensor. While under there I grabbed a 7/8" wrench and easily turned it loose. Sometimes you get lucky.

Gary

 

[N-Wing]

It must be the weather... I just had P0141 myself. NOTE!!!! The website http://www.oxygensensors.com/ has them for a good price BUT until 1hr ago the website was wrong. I got the wrong sensor twice and just confirmed with the guy that there was an error. They made it right and are sending me the new one now.

P0141 is Bank 1 Sensor 2 (so the rear most facing bank, and the sensor closest to where the exhaust exits). It a bit tough to get too on my 2000. I had to buy another shorter sensor tool as my other one didnt fit.

 

[captngaryr]

It must be the weather... I just had P0141 myself. NOTE!!!! The website http://www.oxygensensors.com/ has them for a good price BUT until 1hr ago the website was wrong. I got the wrong sensor twice and just confirmed with the guy that there was an error. They made it right and are sending me the new one now.

P0141 is Bank 1 Sensor 2 (so the rear most facing bank, and the sensor closest to where the exhaust exits). It a bit tough to get too on my 2000. I had to buy another shorter sensor tool as my other one didnt fit.

Hi Mike,
I bought the NGK sensor from Amazon for $82. I read where the NGK sensor was more reliable than the other aftermarket brands (supposedly). The part number is 24584. I had no trouble getting the sensor out, but pulling the connector was a %$##&. I need smaller hands , I guess. I reset the ECM and she's running fine now. Good luck.

Gary

 

[scammy]

What is the first sign a sensor is going off/failing?

 

[ftuhy]

What is the first sign a sensor is going off/failing?

For the case discussed here of the heater failing, there is no warning. Just one day you get an MIL light and the code for the blown heater circuit. The heater part simply blows open. Up 'til then everything works fine. See #3 in this string for the impact.

Of course the sensing part of the O2 sensors also can fail. That is usually slowly deteriorating, slowly affecting emissions, gas mileage, etc. Eventually it can light the MIL and raise a code for a failed sensor. There are lots of Prime posts on this under emissions problems, etc.

 

[robbiedawg]

i had the po141 code a couple years ago.the mechanic suggested doing the other o2 sensor on the same bank at the same time.it turned out to be a good thing,bc the other one had failed too,and i think there was that code behind the other code.i got oem sensors for the ridiculous price of about $500 for both .next time i'll get the sos sensors which run about $134 for both

 

[Sonic*]

I had the same problem happen to me not long after i bought my NSX. Was diagnosed as bank 1 sensor 2. I bought a replacement off ebay(much cheaper!)and the engine management light went out soon after. The strange thing was i normally always fill up with Esso supreme which is 97ron. As soon as i switched and used Shell vpower 99ron the light came back on! Ran a tank full of Esso through again and it went out, so always fill up at the same garage.
I have been told that different fuels can make them a bit temperamental?