When I thought all was well - CEL HELL!!

[toine888]

Well..... (lets an angered sigh out)

I picked the car up from Mazda last Friday after they had replace the 3 blown Coil Packs and run some diagnostics on the cause and checking of the wiring.
The car ran fine over ther weekend until Sunday night driving back from my brothers mechanics when my CEL came on. Everything felt normal, temp guage stayed in the usual spot, no big difference.
I got home and decided to detatch the negative battery terminal to see if it would stop the CEL... which it did - great.
Last night however CEL came back on. I thought ill take it back to Mazda so i did this morning. there all day, they said the code on the MDF (or whatever they use) was relating to the left Oxy Sensor - they tested both oxy sensors and they are fine, but something in the loom or somewhere else is causing the ECU to think there is a problem with an Oxy Sensor - So once again, my car sleeps at Mazda

Any ideas what it may be? ALso anyone think its related to the issue at the panel shop and my 3 blown coil packs? im really angry, i just cant believe its a co incidence that this has all happened since my car was under someone elses care...... i really want to know exactly what happened there..

[2XS]

Check the wiring in to the ECU.

[mazda6mps]

or the pnp harness..somethings gotta be lose somewhere.

[toine888]

Oh forgot to say I'm not running the standback and pnp harness it's all back to stock for now. I'm hoping it's not connected to when the pnp was on... I doubt it

[lup15]

fu*k feel for you man. nothing worse than car troubles, especially electrical. good luck with it all, hopefully the problem will be small and ez to fix

[Caffeine Fiend]

Good luck Ant


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[luke 3mps]

check the exhaust sensor! my neo had the exact problem mazda couldnt find it.. They said the sensor was fine i took it to them 2 times to newcastle( car was running rough), than the CEL came on i cleared it and took it to them again once again couldnt find it. So when the cel came on i took it to mazda in Singleton (my mazda dealer now for 3 years) GEUSS WHAT it was? yep u got it exhaust sensor..

[toine888]

Spot on Luke thankfully my mazda dealer figured that out it was an oxy sensor gunked up with carbon so they cleaned and all ok no CEL
thanks for your help guys

[bd581]

The cause would be because of the previous miss, so if your still arguing with the panel shop, you should claim this too

[toine888]

Yeah I thought that would be the case mate but luckily Mazda only charged me $55. Maybe I should invoice panel shop for that I mean that's a slab!