the goat Posted January 11, 2018 Share Posted January 11, 2018 hi folks my lads 07 reg 12.5 fiesta has got the P0030 fault, omcom said p0030 H02s bank1 sensor 1, open circuit, H02s11 malfunction, suspect H02S11 after read a few posts I changed the oxygen sensor at back of engine (in exhaust manifold before the cat) still showing the same fault, I'll there any relays of fuses to check ? I've got a Haynes manual but they are hopeless nowadays, also looked for wiring diagrams in some Tech manuals I've downloaded but they don't have any wiring diagrams please be easy with me, i'm an old man now and these stuff takes a long time for me to work it out I've just read check fuse 13 (20amp behind glove box) that is OK if I clear the fault and rescan it comes back on right away Quote Link to comment Share on other sites More sharing options...
the goat Posted January 11, 2018 Author Share Posted January 11, 2018 bit more info checked the lambda connector (loom side ) top left as looking at it eg 10 oclock position reads 4.5 volts top right eg 2 oclock position reads 11.8 volts ( checked this at battery, battery reads 11.8 volts will try to charge battery) both bottom connections 0 volts that was with the ign on Quote Link to comment Share on other sites More sharing options...
the goat Posted January 12, 2018 Author Share Posted January 12, 2018 Update charged up battery to 12.6 volts started car now no EML fault just to offer advice to those that find this thread if you get EML fault make sure the battery is fully charged , I found on new Lambda sensor that the top 2 connectors are one circuit so test between them should be no or low resistance, my Lambda sensor would not move, had a day's worth of WD40, still would not move, next day Plus Gas & Wouth Rust Ice (freeze spray stuff) about 3 goes with plus gas and 2 goes with Wouth Ice then it moved, remember only enough plus gas to fill the dip the sensor sits in as more goes down the back of the exhaust I did spray the lambda sensor up & down with Wouth Ice 1 Quote Link to comment Share on other sites More sharing options...
Luke od Posted January 10, 2022 Share Posted January 10, 2022 On 1/11/2018 at 12:53 PM, the goat said: bit more info checked the lambda connector (loom side ) top left as looking at it eg 10 oclock position reads 4.5 volts top right eg 2 oclock position reads 11.8 volts ( checked this at battery, battery reads 11.8 volts will try to charge battery) both bottom connections 0 volts that was with the ign on i had the same issue. Top right pin reading 12 volts but top left. Going between 0.3 and 2.7 I think that's the issue but don't know what the cause is or how to fix it Quote Link to comment Share on other sites More sharing options...
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