2002 Nissan Sentra O2 Sensors

CMAGUIRE12

MEMBER
2002 NISSAN SENTRA
4 CYL
FWD
MANUAL
96,000 MILES

I have replaced all four of the o2 sensors, but still receiving a trouble code P0037 which is Bank 1 Sensor 2. Which one is that? Is it the left before catalytic converter? If so I have replaced that one twice within a month. Could it be something else?
Please help tired of looking at the engine light!

Thanks :)

5 Replies

ZACKMAN

MECHANIC
4,202 POSTS

The one on the passenger side after the cat. The trouble code, did it come back on AFTER you reset the ECM?

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Thursday, September 25th, 2008 AT 10:29 AM

CMAGUIRE12

MEMBER
4 POSTS

Yes the engine light came on after I reset. I'm still getting the same code after replacing it twice within a month. Should I repace it for a third time or could something else be triggering the code P0037.

Thanks

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Friday, September 26th, 2008 AT 7:22 AM

ZACKMAN

MECHANIC
4,202 POSTS

The one that you replaced twice was the one before the cat. P0037 refers to the one AFTER the cat. Is your car a "Clean Car" model? Similar to Low Emission vehicle. Did you get the right O2 sensor? There is a difference between the CA and non-CA car.

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Saturday, September 27th, 2008 AT 7:25 PM

CMAGUIRE12

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4 POSTS

So bank 1 sensor 2 is the one After the Cat Left Side? I believe I am non CA, I live in Ma.

Also do the autopart store employees have any idea the bank and sensor area because they told me code P0037 was the one before the Cat left side.

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Wednesday, October 1st, 2008 AT 10:29 AM

ZACKMAN

MECHANIC
4,202 POSTS

It is so unfortunate that some parts stores do not properly train their associates.

P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2)

Bank 1 means the cylinder head that has #1 spark plug. In your case, you only have 1 bank.

Sensor 1 is the one BEFORE the cat. Most of the time it is located on the exhaust manifold. Sensor 2 is the AFTER the cat.

https://www.2carpros.com/trouble_codes/obd2
Good luck