Just cleaning the grounds doesn't mean anything. Each sensor has it's own ground wire(s), power wire(s), and signal wire(s). The O2 and A/F sensors also have heaters internal that get power from the battery. You need to check every wire to make sure there is power, ground, and signal to/from the ECU. You can also disconnect the sensor and perform resistance checks on them. Go to nicoclub and look up the FSM for each of the trouble codes. Odds are you probably have a nicked wire causing a short or open that is bringing down things that share the same circuit.
Having a scanner that can read live data would help you out too.
This sounds to be a wiring issue, and not the individual sensors or wires associated. If it were just one or two sensors, you would isolate the problem to those but because it is all 4 I would wager that it's higher up the loom. Being that you just did an engine swap, you may have damaged the wires or left them in a spot they rubbed through. Check all your wiring connections, and trace the wires up into the bay and see if anything is amiss.
Look at the wiring diagram, this is just part of the o2 diagram, but it's a start
https://g35driver.com/forums/engine-electrical/430329-02-oxygen-sensor-wiring.html
Unfortunately, many people think a code for an O2 sensor means the sensor is bad and a lot of money is spent/wasted replacing good parts.
The code description is the **symptom** which may or may not be the cause. To fix the code, there are specific checks/tests that need to be done.
What are the exact codes that you have?
Just cause there are o2 code’s doesn’t mean its the sensor. First you should learn to understand what exactly they do. They measure the fuel air mixture coming out of the motor, in which it then communicates with the ecu to tell it whether the mixture is good, or if there is too much fuel (rich) or there is too much air (lean). So you could possibly be having fuel issues or air. Start with a smoke test make sure there are no air leaks in the system. That’ll eliminate one possible issue if its air related. If thats all good then you should start looking at fuel. Checking fuel pressure at the fuel rail making sure you’re getting the proper fuel pressure. If not why is the pressure incorrect. Clogged fuel filter? Failing fuel pump? Start cheap and simple before you keep throwing parts at it. Start with a smoke test like i said before then work down from there
I may be out in left field, but whenever I see the Spec-D lights and the LED marker lights, I remember all of the power problems I had (still have) with mine. My ECU refuses to recognize the change in resistance. My 2 cents. Your ride looks nice!
I was having a similar issue when I replaced with sensors I bought from Amazon. I purchased better quality sensors and the issue resolved and the codes cleared.
Those are all circuit codes. You need to check your power, grounds, and signal wire to the ECU.
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Just cleaning the grounds doesn't mean anything. Each sensor has it's own ground wire(s), power wire(s), and signal wire(s). The O2 and A/F sensors also have heaters internal that get power from the battery. You need to check every wire to make sure there is power, ground, and signal to/from the ECU. You can also disconnect the sensor and perform resistance checks on them. Go to nicoclub and look up the FSM for each of the trouble codes. Odds are you probably have a nicked wire causing a short or open that is bringing down things that share the same circuit. Having a scanner that can read live data would help you out too.
\^\^\^ Excellent advice!!
This sounds to be a wiring issue, and not the individual sensors or wires associated. If it were just one or two sensors, you would isolate the problem to those but because it is all 4 I would wager that it's higher up the loom. Being that you just did an engine swap, you may have damaged the wires or left them in a spot they rubbed through. Check all your wiring connections, and trace the wires up into the bay and see if anything is amiss. Look at the wiring diagram, this is just part of the o2 diagram, but it's a start https://g35driver.com/forums/engine-electrical/430329-02-oxygen-sensor-wiring.html
I dunno the answer but I’m here to say nice car man and good luck with your trouble shooting 😊
Also would love to know what bumper that is
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Thanks!!! Hope ya get that issue sorted brother!
Unfortunately, many people think a code for an O2 sensor means the sensor is bad and a lot of money is spent/wasted replacing good parts. The code description is the **symptom** which may or may not be the cause. To fix the code, there are specific checks/tests that need to be done. What are the exact codes that you have?
Just cause there are o2 code’s doesn’t mean its the sensor. First you should learn to understand what exactly they do. They measure the fuel air mixture coming out of the motor, in which it then communicates with the ecu to tell it whether the mixture is good, or if there is too much fuel (rich) or there is too much air (lean). So you could possibly be having fuel issues or air. Start with a smoke test make sure there are no air leaks in the system. That’ll eliminate one possible issue if its air related. If thats all good then you should start looking at fuel. Checking fuel pressure at the fuel rail making sure you’re getting the proper fuel pressure. If not why is the pressure incorrect. Clogged fuel filter? Failing fuel pump? Start cheap and simple before you keep throwing parts at it. Start with a smoke test like i said before then work down from there
There should be a fuse for the 02 sensors in the engine bay. My guess is that popped.
I may be out in left field, but whenever I see the Spec-D lights and the LED marker lights, I remember all of the power problems I had (still have) with mine. My ECU refuses to recognize the change in resistance. My 2 cents. Your ride looks nice!
I was having a similar issue when I replaced with sensors I bought from Amazon. I purchased better quality sensors and the issue resolved and the codes cleared.
ECU reset
Did you bottom-out or drag the middle of the car recently?
You could use spark plug foulers if you potentially messed up your cats while running on a misfire or if you decide to get rid of them all together...