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as above what justin said and also get your tuner to check the MAP sensor settings for whatever MAP sensor is installed.
they may have to also adjust the min/max expected voltage levels
P0068 is map sensor out of bounds or correlation error.
for example a omni 3 bar map sensor (your may be different and scalings can be in metric or imperial
3 Bar OMNI MAP sensor ECUTEK scaling in BAR
Omni 3 Bar MAP Sensor (Metric in Bar)
0.617 - MULTIPLIER
0.03 - OFFSET
scaling limits 0 - 4.75v
Manifold Pressure Sensor Limits - (CEL still comes on )
High Input CEL Above - 5.00v
Low Input CEL Below - 0.00v
or sometimes they just
Disable CEL P0103 and P0068 but safer to leave them in
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