oxygen sensor
which oxygen sensor is the one that goes to the front engine?
I want to replace one that causes a gas leak. Is there two that go in front of the engine or is it only one? Also, how are they removed? is there a special tool for it. I don't want to use a special tool. thanks |
VQ35DE engine have
Two Primary 02 sensor: upstream, before the catalytic converter. 1 : near the firewall with blue wire 2: near the radiator with blue wire Two Secondary O2 sensor: downstream, after the catalytic converter. 1. Near the radiator ( above it : Primary 02 sensor ) with red wire 2. Near the oil pan : with white wire. Hook up your vehicle to OBD II scan tool to check for specific errors code. |
None of them cause "gas leaks." If you have a bad primary sensor you can end up running a rich air/fuel ratio which causes excess gas consumption, but no leak. And yes, you'll need an O2 wrench to remove them unless you want to clip the wires and use a deep socket.
Are you getting a check engine light and code for an O2 sensor? |
Originally Posted by Unclejunebug
(Post 8980456)
None of them cause "gas leaks." If you have a bad primary sensor you can end up running a rich air/fuel ratio which causes excess gas consumption, but no leak. And yes, you'll need an O2 wrench to remove them unless you want to clip the wires and use a deep socket.
Are you getting a check engine light and code for an O2 sensor? |
Those 2 codes are not for O2 sensors.
P0442 and P0455 are both codes for the fuel tank cannot be vacuumized. Common cause is the gas tank cap loose, missing or defective. But any kind of a leak in the tubing for all the emissions stuff can also cause the codes. Read the manual for the codes and start checking. Page 359 for P0442. Page 403 for P0455. |
Originally Posted by DennisMik
(Post 8980486)
Those 2 codes are not for O2 sensors.
P0442 and P0455 are both codes for the fuel tank cannot be vacuumized. Common cause is the gas tank cap loose, missing or defective. But any kind of a leak in the tubing for all the emissions stuff can also cause the codes. Read the manual for the codes and start checking. Page 359 for P0442. Page 403 for P0455. |
I can't tell you a specific part. You could have a damaged metal line that got hit by a rock, you could have a rusted out fuel filler tube, the pressure sensor could be bad, lots of things. If you read the manual, you saw that they gave you a list as long as your arm. All I can say is keep working at it.
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Originally Posted by egali045
(Post 8980502)
I tried everything. I changed the vapor canister, control valve,gas cap, vapor canister's/control valve hoses. what's next? the front sensor where the oxygen sensor connect?
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Originally Posted by maxiiiboy
(Post 8981012)
I suggest you first disconnect your battery overnight. It's possible that your trouble codes may go away - many of us solved our problems in this manner. Continue chasing your problem only if the codes/CEL persist even after disconnecting your battery.
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Originally Posted by egali045
(Post 8981192)
It will go away but at some point it returns back. Sometimes, it turns off by itself but always comes back. I don't know what makes it do that.
On my car (2000 SE), it was set twice during my 14 years of ownership:
In the first case, the CEL annoyed me for several months but then it went away on its own. By the time the second incident happened, I was smarter and cleared the light (and codes) by disconnecting the battery . |
Originally Posted by maxiiiboy
(Post 8981204)
The O2-related codes are set by thresholds that by Nissan's own admission are too tight (something like 5% deviation from the nominal value). So, whether this code gets set, or does not get set, depends on many things.
On my car (2000 SE), it was set twice during my 14 years of ownership:
In the first case, the CEL annoyed me for several months but then it went away on its own. By the time the second incident happened, I was smarter and cleared the light (and codes) by disconnecting the battery . I've also tried disconnecting the battery overnight but it does clear for like a day. |
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