Catalyst/Heated O2 Sensor not ready
#1
Catalyst/Heated O2 Sensor not ready
2004 G35 Coupe with 67K miles
I am in California and I am trying to pass smog test. Here is what's happening:
Got a P0037 and P0057 DTC and changed both down stream Heated O2 sensors. Completed drive cycle to reset the ECU and turned off CEL. Took it to get smogged and it states Catalyst and Heated O2 sensor not ready. (everything else is good)
Pulled DTC and it shows a P0057 pending and N/A as a fault? CEL comes on after 18 miles of driving.
I have checked the wiring and the O2 sensor fuse and all are good. Last thing should be the ECU so I am posting here to see if anyone who is smarter than I am on the G35 can help me out.
A few suggestions from other people........Cat problem. shouldn't be because DTC is an electrical problem and you won't know a bad CAT unless it fails emissions.
Upstream O2 sensors are bad causing Cat not ready but no code and the P0057 DTC?
I am in California and I am trying to pass smog test. Here is what's happening:
Got a P0037 and P0057 DTC and changed both down stream Heated O2 sensors. Completed drive cycle to reset the ECU and turned off CEL. Took it to get smogged and it states Catalyst and Heated O2 sensor not ready. (everything else is good)
Pulled DTC and it shows a P0057 pending and N/A as a fault? CEL comes on after 18 miles of driving.
I have checked the wiring and the O2 sensor fuse and all are good. Last thing should be the ECU so I am posting here to see if anyone who is smarter than I am on the G35 can help me out.
A few suggestions from other people........Cat problem. shouldn't be because DTC is an electrical problem and you won't know a bad CAT unless it fails emissions.
Upstream O2 sensors are bad causing Cat not ready but no code and the P0057 DTC?
Last edited by Blacked_out_G35; 07-07-2015 at 03:12 PM. Reason: More info
#4
#5
The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors.
#6
Great
So I have checked out all the wiring and the fuse is in tact, even swapped it with known good cig lighter fuse. I know what the code means just needed to know if there was anything I missed or haven't checked before I replace my ECU. If the sensor and wiring are good (All sensors show available but not ready on my computer ODBII program)
#7
So I have checked out all the wiring and the fuse is in tact, even swapped it with known good cig lighter fuse. I know what the code means just needed to know if there was anything I missed or haven't checked before I replace my ECU. If the sensor and wiring are good (All sensors show available but not ready on my computer ODBII program)
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#8
ODBwiz
I am using ODBwiz program with a ODBlink usb to my laptop shows PID and everything. The O2 sensor show available but not ready. along with O2 sensor heater and catalyst. Dealer say its not likely a Cat because of the mileage. The P0057 DTC shows pending ECU 10 powertrain. CEL stays off when the DTC is pending and comes on eventually but DTC still shows. The ODB program will show a available of All O2 sensors Bank 1 and 2 Upstream and Bank 1 and 2 Downstream but no data is available due to incomplete self test.
#9
I am using ODBwiz program with a ODBlink usb to my laptop shows PID and everything. The O2 sensor show available but not ready. along with O2 sensor heater and catalyst. Dealer say its not likely a Cat because of the mileage. The P0057 DTC shows pending ECU 10 powertrain. CEL stays off when the DTC is pending and comes on eventually but DTC still shows. The ODB program will show a available of All O2 sensors Bank 1 and 2 Upstream and Bank 1 and 2 Downstream but no data is available due to incomplete self test.
#10
I have OBDLink as well (The MX version) also on an '04. If there's anything you want me to check and give back some readings on what normal operating values are for this setup, let me know. I use my phone to read it though, not a laptop. I have a few different phone apps but find the OEM OBDLink software to be surprisingly good.
Kinda reaching the end of my rope on this one now
#11
More info
After talking to the Stealership they tell me that since I can clear the code and have no DTC's for a while indicates to him it is more likely an ECU/ECM problem. Since I have replaced the O2 sensor with an infiniti OEM and still get the code. It shows Pending for Power train ECU10 before it turns back on the CEL. It varies on how long it takes for the DTC to show back up. They say if it were a short in wiring it would be constant because it would fail self check so in my case the ECU is simply not turning on the heater element for the Bank 2 rear sensor and that could be the cause of all the other incomplete checks which causes a "not ready" state.
Thoughts?
Thoughts?
#12
My O2 sensor bank 1 sensor 1 voltage seems to mostly hover around .29 with the lowest value it hits being about .2 and the highest being .8.
My O2 sensor bank 2 sensor 1 voltage seems to mostly hover around .63 with the lowest value it hits being about .4 and the highest being 1.3
Let me know if you need anything else specifically.
Last edited by partyman66; 07-13-2015 at 12:44 AM.
#13
Problem solved
Ok so I got the car on a lift and inspected every wire in the system. P0057 is definitely an electrical problem.
Bingo I found a cut wire under the sheathing on the Bank 2 sensor 2 wire bundle. There was an inconspicuous scratch mark on the sheathing and unless I pulled it back I would have never seen it. I can understand why so many people missed it and why I got the car for such a cheap price.
Passed smog and inspection same day after repair of wire. All systems green.
Always trust your gutt
Bingo I found a cut wire under the sheathing on the Bank 2 sensor 2 wire bundle. There was an inconspicuous scratch mark on the sheathing and unless I pulled it back I would have never seen it. I can understand why so many people missed it and why I got the car for such a cheap price.
Passed smog and inspection same day after repair of wire. All systems green.
Always trust your gutt
#14
Ok so I got the car on a lift and inspected every wire in the system. P0057 is definitely an electrical problem.
Bingo I found a cut wire under the sheathing on the Bank 2 sensor 2 wire bundle. There was an inconspicuous scratch mark on the sheathing and unless I pulled it back I would have never seen it. I can understand why so many people missed it and why I got the car for such a cheap price.
Passed smog and inspection same day after repair of wire. All systems green.
Always trust your gutt
Bingo I found a cut wire under the sheathing on the Bank 2 sensor 2 wire bundle. There was an inconspicuous scratch mark on the sheathing and unless I pulled it back I would have never seen it. I can understand why so many people missed it and why I got the car for such a cheap price.
Passed smog and inspection same day after repair of wire. All systems green.
Always trust your gutt
#15
Sorry to reply uber late to this forum.
I am having a similar issue with my g35 03 130k. The Code is p0057 and i have checked all wiring, fuses and replaced both dowstream sensors. I have put on nee NTk sensors since they are the oem brand. My mechanic says i might need new catalyc converters but he us not sure it will fix the problem. The dealership says its an electrical problem and most likely the ECM. Any thoughts or ideas?
I am having a similar issue with my g35 03 130k. The Code is p0057 and i have checked all wiring, fuses and replaced both dowstream sensors. I have put on nee NTk sensors since they are the oem brand. My mechanic says i might need new catalyc converters but he us not sure it will fix the problem. The dealership says its an electrical problem and most likely the ECM. Any thoughts or ideas?