CEL on from sensor/ heater malfunction, bank 1 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

devonkyle77 · 08-09-2006, 07:43 PM

sensor/ heater malfunction, bank 1

thats what the code was that threw a CEL on my 97 240sx

how do i diagnose this?
i changed the 02 sensor a few months ago.

g6civcx · 08-09-2006, 11:01 PM

#1 in my sig. EC section. Page 132.

bongnak · 08-10-2006, 01:16 AM

heater bank 1 means o2 before the cat. so the o2's heating functions no worky. also look under the hood if its still stock, theres an emissions tag and should tell u if you need a o2 sensor or an air fuel meter sensor, IT does matter!. trust me. take a pic of the tag and i can show you. try not to use autozone universal sensors too...

devonkyle77 · 08-10-2006, 06:43 AM

the only 02 sensor i can find is the one that goes into the exhaust manifold. where is the other one?

devonkyle77 · 08-10-2006, 06:44 AM

and where is the emissions tag and air fuel meter sensor?

g6civcx · 08-10-2006, 07:00 AM

The OBDII S14s have 2 O2 sensor. The secondary is further downstream.

Did you do #1 in my sig? Nobody will spoonfeed you.

Well, I'll spoonfeed you if you show effort, and Russ will spoonfeed you but he'll call you all kinds of names. Half of the rest of the people don't know what's going on, and the other half will flame you for not trying.

devonkyle77 · 08-10-2006, 07:12 AM

i have a full aftermarket exhaust, starting with a downpipe. no bungs for 02 sensor. i dont see an 02 sensor further down at all.
yes i did number 1.

projectRDM · 08-10-2006, 07:15 AM

Bingo. Secondary O2 sensor is used for OBD purposes only but is required or it will throw a code. Primary is for air/fuel mixture, car runs open loop without it.

The secondary is supposed to be mounted in the downpipe, downstream from the catalytic converter. The plug comes off the lower harness, should be just hanging by the tail end of the transmission.

g6civcx · 08-10-2006, 07:47 AM

Weld on a secondary O2 sensor bung, or get an OEM-replacement unit.

As for non-street legal options, you can get an O2 simulator, bypass the CEL, or run a piggyback/standalone ECU.

Quote:

Originally Posted by devonkyle77

i have a full aftermarket exhaust, starting with a downpipe. no bungs for 02 sensor. i dont see an 02 sensor further down at all.
yes i did number 1.

Page 7 of the FE section.

08-10-2006, 01:16 AM	#3
bongnak Zilvia Junkie Join Date: Jan 2005 Location: So-Cal Age: 41 Posts: 337 Trader Rating: (3) Feedback Score: 3 reviews	heater bank 1 means o2 before the cat. so the o2's heating functions no worky. also look under the hood if its still stock, theres an emissions tag and should tell u if you need a o2 sensor or an air fuel meter sensor, IT does matter!. trust me. take a pic of the tag and i can show you. try not to use autozone universal sensors too... __________________ Zzzz

08-10-2006, 06:43 AM	#4
devonkyle77 Post Whore! Join Date: Sep 2003 Location: md Age: 41 Posts: 3,091 Trader Rating: (3) Rides Gallery: devonkyle77 Feedback Score: 3 reviews	the only 02 sensor i can find is the one that goes into the exhaust manifold. where is the other one? __________________ WTB-NARDI wheel & NRG 2.8 QR

08-10-2006, 06:44 AM	#5
devonkyle77 Post Whore! Join Date: Sep 2003 Location: md Age: 41 Posts: 3,091 Trader Rating: (3) Rides Gallery: devonkyle77 Feedback Score: 3 reviews	and where is the emissions tag and air fuel meter sensor? __________________ WTB-NARDI wheel & NRG 2.8 QR

08-10-2006, 07:12 AM	#7
devonkyle77 Post Whore! Join Date: Sep 2003 Location: md Age: 41 Posts: 3,091 Trader Rating: (3) Rides Gallery: devonkyle77 Feedback Score: 3 reviews	i have a full aftermarket exhaust, starting with a downpipe. no bungs for 02 sensor. i dont see an 02 sensor further down at all. yes i did number 1. __________________ WTB-NARDI wheel & NRG 2.8 QR

08-09-2006, 07:43 PM	#1
devonkyle77 Post Whore! Join Date: Sep 2003 Location: md Age: 41 Posts: 3,091 Trader Rating: (3) Rides Gallery: devonkyle77 Feedback Score: 3 reviews	CEL on from sensor/ heater malfunction, bank 1 sensor/ heater malfunction, bank 1 thats what the code was that threw a CEL on my 97 240sx how do i diagnose this? i changed the 02 sensor a few months ago. __________________ WTB-NARDI wheel & NRG 2.8 QR

08-09-2006, 11:01 PM	#2
g6civcx Post Whore! Join Date: Apr 2004 Location: Virginia, USA Posts: 5,764 Trader Rating: (5) Feedback Score: 5 reviews	#1 in my sig. EC section. Page 132.

08-10-2006, 07:00 AM	#6
g6civcx Post Whore! Join Date: Apr 2004 Location: Virginia, USA Posts: 5,764 Trader Rating: (5) Feedback Score: 5 reviews	The OBDII S14s have 2 O2 sensor. The secondary is further downstream. Did you do #1 in my sig? Nobody will spoonfeed you. Well, I'll spoonfeed you if you show effort, and Russ will spoonfeed you but he'll call you all kinds of names. Half of the rest of the people don't know what's going on, and the other half will flame you for not trying.

08-10-2006, 07:15 AM	#8
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	Bingo. Secondary O2 sensor is used for OBD purposes only but is required or it will throw a code. Primary is for air/fuel mixture, car runs open loop without it. The secondary is supposed to be mounted in the downpipe, downstream from the catalytic converter. The plug comes off the lower harness, should be just hanging by the tail end of the transmission.