annibrown38

Mercedes E Klasse OBD Readiness Issue

My 2007 Mercedes E Klasse with a gasoline engine is showing a check engine light and says the system readiness check is incomplete I recently used an OBD2 scanner I'm guessing that's the cause Has anyone encountered this OBD readiness issue before

A 2007 Mercedes E Klasse displayed a check engine light and an incomplete system readiness check after using an OBD2 scanner. The issue likely stemmed from clearing codes, which reset the OBD readiness monitors, requiring the car to complete a drive cycle to re-run self-tests. After driving approximately 80 km, the readiness was restored, and a vehicle inspection confirmed all systems were functioning correctly, resolving the issue without any repair costs.

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4 comment(s)

Whoa hang in there I've got an E Klasse too and I had a similar issue after using a cheap OBD2 reader It sounds like you've messed up the OBD readiness monitors Basically it means your car's computer hasn't finished running all the self-tests it needs to Did you try to force anything with the OBD tool

Force anything Not intentionally no I just scanned for codes and then cleared them I didn't change any settings or try any advanced functions Is it possible the computer reset itself erasing the drive cycle data even though I just cleared the codes

Yup clearing codes can sometimes reset those monitors It's annoying The system readiness needs to be met for vehicle inspection too Now the car needs to re-run all the tests and that can take a while I had to drive mine for days before it was ready If it doesn’t reset after a week take it to a workshop

Thanks I drove the car for around 80km and now the check engine light is gone and the OBD readiness is set A vehicle inspection confirmed that every system is working as expected I don't need to pay anything at the workshop so the final repair cost was 0€ Never gonna use an OBD2 scanner again

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MERCEDES

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EKLASSE