Peugeot 307 sensor fault

Depollution system faulty indicator on most of the time, occassionally goes off for a few days. Tried bottle of forte, went off for a while then back on. Computer diagnostics:
permanent fault. Upstream oxygen sensor open circuit
permanent fault fan assembly high speed command fault (hand written "this is working at present")
Intermittent fault upstream oxygen sensor heating command
Car drives same as always, no problem, but garage say the mix will be wrong if sensor not working.
Before we pay £255 to replace the oxygen sensor, is there anything obvious we should check that might affect this? Car done 60K, ours from new and in good nick.

Asked on 4 July 2011 by SHS

Answered by Alan Ross

Well if the diagnostic check is saying a oxygen sensor fault then you should accept it. If left it will start to send signals to the ECU (engine management system) which could then adjust the fuel system to compensate. This will result in reduced MPG. In addition it would most likely result in the car failing its next MOT because of emissions.

Tags: oxygen sensors technical issues fault codes diagnostics

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