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Hello. I was hoping to get some final results about how people fixed the problem when the above three codes appear at once. The board shows several people getting this code but not many final result.
Summary: 1999 9-3 convertible 2.0l non-HO
P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
Somehow all three are related: one problem causing all three faults
Some seemed to have fixed it after replacing both O2 sensors. It is odd however that both O2 sensor would go at once.
Some have suggested making sure Thermostat is functioning correctly. This may addresses p0125 code, but question it relation to "Closed Loop Fuel Control" and not sure how it is related to other 2 codes.
Some have suggested the "Lambda Sond" fuse since, that is what powers the O2 heaters. When I checked that and found there was no fuse in slot (some one else found that theirs was missing as well). If it indeed was missing them I doubt that the fuse dose anything as I have run it this way for >6 years. I question that it was missing because around the same time my cabin heater/AC fan stopped working; while diagnosis that I check the fuses and may have removed the fuse accidentally. (As a side note, the fan problem turned out to be a bad connection at the fan itself, thanks BB for helping discover that). I am not sure whether the Check engine light went on before or after the fan stopped.
As a first step i put in a fuse for the Lambda Sond. The Check engine light is still on, but I am not sure if it will go off automatically, or if it needs to be cleared. Guy at autozone refused to clear the code saying he could get fined (funny, I have had others do it). I know I can clear it by disconnecting the battery for 5 minutes, but I will do that only if I need to. Do I need to?
Thanks for you help.
Keith
posted by 199.190.17...
, Mon, 23 May 2011 16:07:51
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