Year of Manufacture *: 2000 Engine Code or Type *: 1.6i 16v ( Optional ) Scanner used: KTS
Hi all.
I suspect I have a faulty new O2 sensor on this one but I would like to clarify my findings.
On live data the O2 sensor voltage sits constantly at about 0.6v at idle. If you rev the engine hard the voltage does not increase but, as you let the throttle off, it will momentarily decrease. It then returns to 0.6v.
Am I right in thinking this sensor should switch/react in the normal way?
I have tested the voltage at the sensor to confirm the ECU is reporting an accurate reading. The reason I'm a bit uneasy is that there are five wires on the multiplug.
The emmisions are sitting at 0.55% co, 1.06 Lambda, 1.8% O2 & 14.1 CO2.
The customer also reports a loss of power on hills when the fuel level is low - I wondered about a faulty pump but the fuel pressure is steady at 35psi
Someone else diagnosed the sensor as faulty but I don't know what readings they got.
Posted by Kevin Apps on April 15, 2009, 10:20 pm, in reply to "VW Golf 1.6 16v O2 Sensor" Kevin Apps
Paul. An engine code would help ! I suspect Aidan is correct in it being a wide-band sensor,so does it have a calibration resistor at the multiplug ? Kev.
The post-cat O2 sensor is sitting at o.1v occasionally lifting to 0.4v unless I snap the throttle open. It then fluctuates until the emmisions settle.
There is no resistor fitted to the multi-plug of the O2 sensor on the car. I forgot to mention that the multiplug on the car has 6 wires (the O2 sensor has 5).
The customer has, under interrogation, now told me that the MIL light only comes on on the motorway and sometimes lacks power, other times it's ok. He says the code is for 'emmisions faulty' (I'm guessing catalyst efficiency). He has cleared the code with his own Code reader he got of the tinterweb!!! It has had a non genuine cat fitted too!
I will do a search in archives to see if checking wide band O2 sensors has been discussed.
I can't help thinking that the pre-cat O2 sensor should do something when the throttle is snapped open. I was checking on graph rather than a voltage value.
Paul. Before you get too involved ask your customer what fuel he is running the AUS on, it should be 98ron super unleaded, look inside the filler flap if you or he does not believe me. Kev.
on April 15, 2009, 8:10 pm, in reply to "