[Alexander]

Welding on the sill, had a couple of small holes that needed sorting out.

[Alexander]

Thanks guys. The original sensor didn’t provide a voltage at all (it may have been in the car for 70k miles).

The battery has been disconnected a few times, the longest period was for 2 weeks while I welded up a couple of holes on the driver side sill. All I have is a cheap OBDII reader to grab and erase codes with, and a multimeter. On a timeline scale, I serviced it prior to an MOT, it failed it’s MOT back in the 2nd week of January. I Took the car home, and did an initial diagnostic flow. Didn’t find any other faults (no air leaks, SPI creates fine mist that is difficult to see, not dripping, no fuses blown, no exhaust leaks, no blocked vacuum hoses). Checked the spark plugs (brand new, gapped to suzuki specs), they came out black. Replaced the distributor and rotor, re-gapped to NGK specs, tested. Re-gapped to Suzuki specs and ordered the first HO2S. I then began welding while the new sensor arrived. After arrival, I re-connected the battery post-fitting, ran the car through 6 driving cycles, clearing the code that popped up every 2 cycles. I then got the multimeter out, found no shorts on the loom, but the sensor was throwing out 0.97-1.01v, so I sent it back. Finished the welding, received the 2nd new sensor and repeated the process again.

I’ll try and source a reader with live data, but if another sensor was to fault, would it not give a code for that sensor too? How likely is it to be a faulty ECM?

[Author]

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