O2 Sensor Question
Thread Starter
Joined: Feb 2007
Posts: 9,486
Likes: 67
From: Melbourne, Australia
O2 Sensor Question
Hi Guys,
I put in an after market front pipe and now have the dreaded CEL.
I am looking at fixing this in the ECU but before I can I need to understand the rear O2 sensor.
Q) Why do we get 0-5volt readings, isn't it a narrowband sensor?
Cheers
Dave
I put in an after market front pipe and now have the dreaded CEL.
I am looking at fixing this in the ECU but before I can I need to understand the rear O2 sensor.
Q) Why do we get 0-5volt readings, isn't it a narrowband sensor?
Cheers
Dave
- I have been able to successfully avoid a CEL from the 2nd O2 sensor by using the "spark plug anti-fouler method" described here on the forum. I also have a complete turbo back exhaust with no catalyst. I ended up having success with a single, longer spark plug anti-fouler and then drilling it out almost all the way to the end so the O2 sensor will fit inside it. No SES after more than 2 months now. If you search the forum for "spark plug antifouler" I'm sure you'll find a how-to.
- I have read about a method of "disabling" the second O2 sensor so that it can be completely disconnected. This involved changing some values in the ECU (using ECUFlash and a Tactrix cable for example), and then also using a resistor to simulate the load of the O2 senor heater. AFAIK, no one has figured out how to completely disable the second O2 in the ECU yet, but that might be coming some day.
Hope that helps!
the rear o2 sensor is a narrow band. it goes from 0 - 1 volt. the factory use it to monitor the efficiency of the converter. if the reading from the rear o2 sensor is very close to the o2 sensor in the front for more the a few seconds then it will turn on the check engine light. where did you see it go to 5volts?
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Thread Starter
Joined: Feb 2007
Posts: 9,486
Likes: 67
From: Melbourne, Australia
evoscan:
if you like I can post a graph that shows it going up to 5V when on boost...
Code:
LogID TPS RPM Timing O2Sensor O2Sensor2 Speed IPW IDC KnockSum LoadMUT2Byte RPMMUT2Byte 1 13.33 1437.5 7 0.9165 1.248 0 2.304 2.76 0 37.50 1417.96875 2 13.33 1406.25 7 0.9165 1.248 0 2.304 2.70 0 38.13 1417.96875 3 13.33 1406.25 8 0.9165 1.2285 0 2.304 2.70 0 38.13 1425.78125 4 13.33 1406.25 7 0.9165 1.248 0 2.304 2.70 0 37.50 1425.78125 5 13.33 1437.5 7 0.9165 1.248 0 2.048 2.45 0 38.13 1406.25 6 13.33 1406.25 5 0.897 1.365 0 2.304 2.70 0 43.13 1390.625 7 13.33 1375 6 0.6045 1.443 0 2.56 2.93 0 44.06 1386.71875 8 13.33 1406.25 3 0.117 1.4235 0 2.56 3.00 0 43.13 1414.0625
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