How to find fuse for o2 sensor heater? - Nissan Forums : Nissan Forum
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#1 Old 04-04-2006, 07:05 AM
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How to find fuse for o2 sensor heater?

The fuse box beside the steering wheel doesnt have it in my 97 altima.
Any ideas anyone?

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#2 Old 04-04-2006, 03:35 PM
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Look at the right bank of fuses in the fusebox. Count the 4th fuse from the top. It is a 10A fuse which supplies power to both oxygen sensor heaters. If in doubt, it is the fuse below the 15A one which is for the fuel pump.



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#3 Old 04-04-2006, 03:47 PM
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Quote:
Originally Posted by jserrano
Look at the right bank of fuses in the fusebox. Count the 4th fuse from the top. It is a 10A fuse which supplies power to both oxygen sensor heaters. If in doubt, it is the fuse below the 15A one which is for the fuel pump.
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#4 Old 04-04-2006, 05:15 PM
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Thanks. Always a pleasure to help.



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#5 Old 04-07-2006, 09:01 PM
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*** REPOSTED this from naijaboy's PM for the benefit to others. ***

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You only get a code 92 because the heater must be working before the ECU can monitor for O2 operations to set code 77.

What is the continuity resistance on the rear O2 sensor heater plug? With the ignition key off, check between pin 1 (yellow) and pin 4 (green/yellow) on the plug of the sensor side. It should read between 2.3 - 4.3 ohms. There also should not be any reading between pin 2 and all the other pins. And no reading between pin 3 and all the other pins.

If the sensor heater reads fine then this suguests to me that one of the terminal connections in this entire circuit is very loose. You might have to tighten down or recrimp those loose connections.

One other thing I can think of is to put a 4 ohm resistor between the heater pins to fake out the ECU into thinking it is OK. If the code never returns after you cleared it up then that means that the sensor's heater coil was going bad.



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#6 Old 04-10-2006, 08:25 PM
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Well, the fuse is okay.
Don't have any idea where to check for loose terminal connections and ECU wiring always leaves me confused. I know to look out for the white/yellow wire but there are a few(sigh). Plus while trying to replace the rear o2 with a universal, I think i matched the wires wrongly and now still have the heater code PLUS codes for IACV and EGR solenoid.I'm thinking I caused a short somewhere or something cos when i first mismatched the wires, my rad fan died and i had to check the relay to fix that.Ialso started having poor idling issues when the new codes came up but I bumped up the idle speed a bit with the screw and now it's fine but the codes still stay.
What to do?????

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#7 Old 04-11-2006, 11:16 AM
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Well turned out to be a bad vacuum hose on the EGR solenoid giving me these issues. Changed it and now both new codes have disappeared.
Still have to get a new BOSCH rear o2 sensor.

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#8 Old 04-11-2006, 12:55 PM
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do the codes for the egr ALWAYS come up?
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#9 Old 04-11-2006, 01:56 PM
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It always did, with the IACV code but both disappeared as soon as i changed the hose.

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#10 Old 04-11-2006, 02:21 PM
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really, well i see you have the rear o2 problem like i do..do you have like hesitation problems, because the only codes i have are the rear o2 and the knock sensor, which pry is what is making my car hesitate to accelerate sometimes.
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#11 Old 04-11-2006, 02:27 PM
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No hesitation problems.

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#12 Old 04-11-2006, 08:31 PM
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alright so did you change the hose that goes from the intake or which hose?
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#13 Old 04-12-2006, 07:47 AM
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What codes do you have apart from the o2? I changed the one to the right of the EGR solenoid(from the front). The code has come back twice since yesterday but gone again so im not completely sure im out of the woods yet.Ive even got issues with the MAF.Wiggling the connector sometimes kills the engine or causes poor idle and the code comes and goes.Luckily, i have no poor driveability issues but the CEL drives me crazy.

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#14 Old 04-13-2006, 01:53 AM
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well i have both rear o2 sensor mal. and knock sensor mal. which sucks, and i've read over some threads saying that the knock sensor can cause real bad mpg, and since it makes the timing retarded it dumps a bunch of gas in there causing hesitation...but with this o2 sensor i could care less about, i want to get rid of my cat. anyway.. the hose to the right of the egr, theres a bunch.
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#15 Old 04-13-2006, 07:58 AM
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We have different issues. My egr code and and IACV code are connected.You have no issues with the EGR.

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