'94 with DC headers, need help replacing front oxygen sensor 02

[Xluder]

Hey guys I have DC headers on my nsx and I can't figure out how to replace the front O2 sensor I am getting code 41, car is running fine but the CEL is on..anyone know of a write up on this? The sensor end is just about touching the firewall and can't get to it from top or bottom???

 

[Larry Bastanza]

The 02 sensor is located just rear of the oil pan underneath. Actually the easiest one to get to. A little tight, but not too bad. Use a good o2 sensor wrench. Remove/install new one, connect wires. Reset CEL by removing the 7.5 amp clock fuse, drink beer.

HTH,
LarryB

 

[Xluder]

The 02 sensor is located just rear of the oil pan underneath. Actually the easiest one to get to. A little tight, but not too bad. Use a good o2 sensor wrench. Remove/install new one, connect wires. Reset CEL by removing the 7.5 amp clock fuse, drink beer.

HTH,
LarryB

Hey LarrB,

I have already replaced the down stream but the CEL is still on, I need to replace up stream, pre-cat and that is the one I can't figure out how to get to, any help would be appreciated....

 

[Larry Bastanza]

Hey LarrB,

I have already replaced the down stream but the CEL is still on, I need to replace up stream, pre-cat and that is the one I can't figure out how to get to, any help would be appreciated....

What do you mean "downstream", a 1994 car has only 2 sensors, front and rear in front of the cat?

Regards,
LarryB

 

[Stevon]

You just might have the early 95 production year ODB2 cars. My 95 is one and have had a heck of a time getting O2 sensors working and connecting a scanner to ECM for trouble shooting (see page 2) http://nsxprime.com/forum/showthread.php?t=142908 I have the early exhaust on my 95 car and had to have Pro-Speed make me custom Cats with the front and rear bungs to install the 4 O2 sensors required for the ODB2 cars. You may have to unbolt the Cat to get access to the sensor, will need a new exhaust gasket.

Stephen

What do you mean "downstream", a 1994 car has only 2 sensors, front and rear in front of the cat?

Regards,
LarryB