Are the onboard diagnostics OBD-II and emissions monitoring systems functioning reliably?

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Are the onboard diagnostics OBD-II and emissions monitoring systems functioning reliably?

Are malfunction indicator lights MIL illuminating for emissions faults? What types of codes e.g. P0420, P0171 have been logged, and how frequently?

Qalb E Momin asked on 10 Jun 2025 17:46:36 pm

1 Answer

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Car Mechanic Expert - on 10 Jun 2025 17:50:14 pm

In general, Alsvin’s OBD-II system works reliably, but there are quirks:

Users occasionally report MIL lights for P0420 and P0171 lean condition.

The MIL is sensitive to fuel quality changes—drivers see more lights after a bad tank of fuel.

Software updates have improved OBD reliability, but early models 2021–2022 had frequent false-positive MIL triggers.