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Old 05-31-2019, 03:40 AM
paullap paullap is offline
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Default O2 sensor pids

I have a 56 plate Citroen c2 1.4 petrol with the mill light keeps coming on.

Codes
P0138 Downstream oxygen sensor signal problem
P0132 upstream oxygen sensor signal problem
P0130 Upstream oxygen sensor signal

Now the weird thing is this, I go in to diagnostics via model year ect and then in to live Data, Upstream and Downstream pids are showing 0 volts straight line as if they are not working at all.

If I go in to obd2 live data it shows both working fine. and no codes
I think i have a wiring problem, but why do they show something different ?.


Paul
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Old 05-31-2019, 09:01 AM
Witsend Witsend is offline
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Sounds like that Citroen will need to go into The Giant Lemon Juice Extractor if you don't find a simple fix, like an exhaust heat shield has dropped and rubbing on the O2 sensor wires.
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Old 05-31-2019, 01:51 PM
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tech25 tech25 is offline
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sounds like a software error in the Citroen sw. normally, the obd2 data is correct and i would go with that..
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Old 05-31-2019, 06:56 PM
Glide Glide is offline
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MIL is on=codes, why would you believe obd2 data if it says there no codes?
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Old 05-31-2019, 08:36 PM
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Try verifying the voltage with a meter to see which one is correct. That'd be my next move.
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Old 06-02-2019, 10:19 AM
kirkbarrow.garage kirkbarrow.garage is offline
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Quote:
Originally Posted by Glide View Post
MIL is on=codes, why would you believe obd2 data if it says there no codes?
Either way, the eml light is on.
Codes or not, ( I have seen no codes and had the light on ) obviously there is a " problem with the car.
It's French, nuff said !
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Old 06-03-2019, 12:16 PM
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Quote:
Originally Posted by Glide View Post
MIL is on=codes, why would you believe obd2 data if it says there no codes?
i did say normally....question.. why would the obd pids show o2 sensor readings when oem side shows nothing??

a sure fire way i would think, would be, in obd mode, and while watching live 02 pid readings, to unplug the o2 sensors and see what readings you get.

and, like what joe said, if you can, back probe, and confirm actual voltages, and compare to pid readings.
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Old 06-04-2019, 08:54 AM
Glide Glide is offline
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Quote:
Originally Posted by tech25 View Post
and, like what joe said, if you can, back probe, and confirm actual voltages, and compare to pid readings.
That should go without saying.Diagnostic process.
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