Is this normal Down Stream O2 sensors read .830v
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Junior Member
Joined: Apr 2023
Posts: 2
Is this normal Down Stream O2 sensors read .830v
Hi all
2015 Ford Flex SEL, Dealing with the dreaded CATs. P0430 code. Car is at 110K. Before I spend the 2000.00 for a CARB approved CATs. I want to go through it. My OBD scanner live data show both Rear sensors steady but at a higher voltage than what I read about rear O2 sensors. I've read or YouTube says should be about 450mv. Now my Scanner reads Milliamps for the upstream sensors. And I get the switching signal and looks normal. But I can't find what would be nominal range. At idle both switch between +45ma and -45ma. Anyone have any insight to the rear cat voltage level. Right now this would indicate rich condition. That needs corrected before I change the expensive parts.
B1S1 & B2S1 switching measured in milliamps.
B1S2 & B2S2 Steady at constant RPM about .830mv.
OBD2 reader Launch 123E. Just hoping for a comparison against another one. I just trying to interpret what I am seeing.
Also Fuel Trims Short and long are slightly negative or positive. but hover at zero.
Thanks in advance.
2015 Ford Flex SEL, Dealing with the dreaded CATs. P0430 code. Car is at 110K. Before I spend the 2000.00 for a CARB approved CATs. I want to go through it. My OBD scanner live data show both Rear sensors steady but at a higher voltage than what I read about rear O2 sensors. I've read or YouTube says should be about 450mv. Now my Scanner reads Milliamps for the upstream sensors. And I get the switching signal and looks normal. But I can't find what would be nominal range. At idle both switch between +45ma and -45ma. Anyone have any insight to the rear cat voltage level. Right now this would indicate rich condition. That needs corrected before I change the expensive parts.
B1S1 & B2S1 switching measured in milliamps.
B1S2 & B2S2 Steady at constant RPM about .830mv.
OBD2 reader Launch 123E. Just hoping for a comparison against another one. I just trying to interpret what I am seeing.
Also Fuel Trims Short and long are slightly negative or positive. but hover at zero.
Thanks in advance.
Senior Member
Joined: Jun 2010
Posts: 16,666
When are you doing the measuring? If the converter has not reached a high enough temp it can't function correctly.
The ideal thing to measure/see is the graph of the voltage. The graph should after the second converter should be almost a horizontal line. Near .(.5 )+,_ a few tenths of a volt.
Don't forget the meter is giving you averages because it is not capable of responding that quickly.
The ideal thing to measure/see is the graph of the voltage. The graph should after the second converter should be almost a horizontal line. Near .(.5 )+,_ a few tenths of a volt.
Don't forget the meter is giving you averages because it is not capable of responding that quickly.
Thread Starter
|
Junior Member
Joined: Apr 2023
Posts: 2
When are you doing the measuring? If the converter has not reached a high enough temp it can't function correctly.
The ideal thing to measure/see is the graph of the voltage. The graph should after the second converter should be almost a horizontal line. Near .(.5 )+,_ a few tenths of a volt.
Don't forget the meter is giving you averages because it is not capable of responding that quickly.
The ideal thing to measure/see is the graph of the voltage. The graph should after the second converter should be almost a horizontal line. Near .(.5 )+,_ a few tenths of a volt.
Don't forget the meter is giving you averages because it is not capable of responding that quickly.
Just realized I put a decimal point in my post It's 830mv not .830mv.
Last edited by Tomb1956; Apr 27, 2023 at 02:19 PM. Reason: Correction for earlier post
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Jan 26, 2013 05:19 PM