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Engine Light ON - P0140 Error Code

15 Jul 2021 19:31 - 15 Jul 2021 19:32 #236713 by DerkDiglett
Hi All,

Please help me as I am having no end of issues with my 2005 Jimny.

My engine light illuminated a couple of days ago and yesterday she started misfiring.

I have attached the image from my OBD reader (taken today) as to what the single error code states, which is P0140 - O2 Sensor... This scenario happened to me back in January. In January I dropped it off to a local garage who carried out the following work:
1st visit: Cleaned out the throttle body and replaced the O2 sensor.
2nd visit (as the above did not solve the misfiring): replaced all four spark plugs, coil pack and conjoining cabling.

This did the trick but now I am experiencing the same problem, although not as bad as back in January with the misfiring, do you guys have any ideas? These two trips to the garage cost me £750 in total and I really do not want to be shelling this kind of money out again.

Thank you all so much and I look forward to hearing back from you.

Last edit: 15 Jul 2021 19:32 by DerkDiglett.

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15 Jul 2021 21:09 - 15 Jul 2021 21:13 #236717 by Scimike
I am thinking cable or connector involved with the 02 sensor. I would start with a visual check of connectors and if they don't look perfect maybe replace with alternatives. If you have a DVM check continuity. You need to start at some point and believing the ODB code is a start, but not always the cause.

Misfire or poor idle is sometimes the crank sensors, so keep that on standby. However you don't normally get a code for these, so not following the normal failure mode. Can you clear the code or is it always displayed after a run?
If you can't clear it it suggests it's a permanent failure and possibly easier to locate.

It's also possible the 02 sensor has just stopped working, but it's a swap and see route unless you have specialist equipment to look at the signal from the sensor.

Yokohama Geolanders, Sony 2D head unit, Elvis Bobblehead, Jimnybits transfer Guard, Hand crafted Indian hanging Elephant, Koni Heavy track dampers, Voodoo Doll with pins (active spell - I believe it's working), Jimnybits Adventure Rack, towbar, Light bar and vintage caravan.
Last edit: 15 Jul 2021 21:13 by Scimike.

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