waynedear
Posted a lot
Posts: 1,364
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Jan 26, 2020 16:42:49 GMT
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A mates 2003 1.4 petrol fiesta has an eml on.
Put my generic reader on it and it came up with 0137 o2 sensor Bank 1 Sensor 2.
I am not sure then which sensor it is
There is one just behind the engine in the top of the manifold, then I am seeing things about post and pre cat.
Can any of you lead me in the right direction please. 😁
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Bicycle x1
Alfa Giulietta (now wife's)
Alfa 156
BMW 630i
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froggy
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Jan 26, 2020 19:01:58 GMT
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Post cat , more likely your cat is tired if the sensor is showing a voltage output , if it’s sitting at .7/.8 volt at idle warm on live data hold the rpm at 3k to see how long it takes to drop to .5
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mk2cossie
Club Retro Rides Member
Posts: 2,946 
Club RR Member Number: 77
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o2 sensorsmk2cossie
@mk2cossie
Club Retro Rides Member 77
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Jan 26, 2020 19:23:00 GMT
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As already said, it will be post cat (after the cat, and let's the ECU know the cat is functioning). In past experiences, it is usually the pre-cat sensor that causes the issues tho. If it will undo easily enough, it is worth taking the pre-cat lambda to see what sort of state it is in and also have a peek inside the manifold at the state of the catalyst honeycomb  |
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waynedear
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Jan 26, 2020 20:30:28 GMT
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Thanks very much.
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Bicycle x1
Alfa Giulietta (now wife's)
Alfa 156
BMW 630i
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