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Ryan5257

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Recently brought my vw Lupo as a first car and had to do loads of work on it so far, my most recent problem is that it's running to rich still? It had a decat and didn't have no lamba sensors or anything like that so was drinking petrol I recently put a cat on it and brought all the sensors and fitted a new exhaust system and it's still running a little rich, I plugged in the dionostics kit and it says rich tread bank 1 sensor 1 any ideas? 

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Literally all it says when I plug it in it just says rich thread bank 1 sensor 1, I didn't know what I meant that's why I asked on here, 

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I dont think it'll mean anything to anyone on here... But i could be wrong! "Thread" "bank"?!?! Its not a "V" engine. And as for thread.... Anyone know much about sewing machine motors? Ah, no, that's the Daihatsu forum....

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have you tried disconnecting the battery to reset the ECU, if its gone from not having a lamba sensor to then having one it may need to relearn and make adjustments as this sensor checks the oxygen in the exhaust system which is a really good guide to whats happening with the combustion process

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Have you managed to make any sense of the error codes?

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Yeah it's this - P0135 is the OBD-II generic code indicating the engine control module (ECM) has tested the O2 sensor heater circuit and has detected a problem with the bank 1 sensor 1 O2 sensor heater circuit.

O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

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For what its worth, Bank 1 Lambda sensor is pre-cat and Bank 2 is after the cat

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Should I have two sensors or should I only have one? Because I thought that I should have to I should have a pre cat and then one for my cat? 

I haven't got round to solving it yet but will be changing the sensor when I've got spare time, 

IMG_1863.JPG

IMG_1864.JPG

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Yes the cure is replace your pre cat lambda sensor, they breakdown inside overtime and can be finished off by a sudden jolt, ie pothole, mine went just before an mot, the dealers said try running it and if that doesn't work replace. You may also have seen a decrease in fuel economy.

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I don't know what the connections are like but if possible have you tried swapping the sensors to see if the problem moves, if its possible and the problem moves its a safe bet its the sensor, if it doesn't then its more likely the wiring

 

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Took the sensor off today and waiting for a new one to arrive so I can fit it, this is the state of the old one,

image.jpg

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That's black... Should be a pale brown colour (like spark plugs). Running rich... 

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Changed it today it isn't running as rich trying clearing the code and it won't clear it keeps coming back on? Ideas?

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