Hello, i have renault megane 1.4 16v 95ps 2000, my check engine light is always on, last year i have changed lambdasensors ,borh before and after cat. , and still i have fsulr df018 , it says something about the lambda sonde -heating circuit lambda sensor front,. I have problem with my rpm, when i stop my rpm goes up and down with touching the gas padel, also somethimes when i drive and pres clutch immediately rpm goes to zero and up again and the car turns off. Should i buy new more expensive lambda sensors, or something else is the problem.Thank you
Bojan123
Joined
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54,247 Posts
would be checking with a volt meter if the heating element was working
Yours must be 4 wires
Two are the heating element
With a voltmeter 1 is 12 volts 1 is earth
So many times these are the wrong way round on after market lambdas.
Its normally ( going on memory here two white ( Heater element , then black and grey but those are signal and earth )
Have known a bad earth on exhaust on the old cars give issues
( Earth wire was attached to the exhaust as exhaust was not earthing well through the car )
Yours must be 4 wires
Two are the heating element
With a voltmeter 1 is 12 volts 1 is earth
So many times these are the wrong way round on after market lambdas.
Its normally ( going on memory here two white ( Heater element , then black and grey but those are signal and earth )
Have known a bad earth on exhaust on the old cars give issues
( Earth wire was attached to the exhaust as exhaust was not earthing well through the car )
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