04 TD4 engine warning light comes on when driving up prolonged hills

Good evening, Im new to this site and looking for some advice.

My TD4 shows an intermittent exclamation mark engine warning light when I drive up or accelerate up prolonged gradients or hills. When I ease off the light disappears until the next acceleration or hill. During this time there is no performance issues and the engine continues to accelerate and drive as normal. I have attached a fault code reader and no faults logged.
I have replaced the MAF sensor and have fitted an EGR bypass but the warning light has remained.
Can anyone suggest what this fault may be and how to resolve the issue?

Many thanks

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