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Engine check light on

Hello All! I have a 2000 model K11 1.0 coil pack Micra. The engine warning light is permanently on. I have changed the O2 and MAF sensors, but after erasing the computer error codes, it still goes on again after a short while. Any suggestions gratefully received!! Thanks!
What code? And did you change the maf for a bosch one or a aftermarket one?
Thanks for your prompt reply Maarten! P0171, fuel mix too lean. If I do the dashboard test by pushing both odometer buttons, the code is 18. Unfortunately, the new MAF sensor is not a Bosch one. Could it be the throttle position sensor? Thanks!