Hello mr. Scotty. I have opel zafira 2001. 74 kw 2.0 TDI and it starts badly in the morning when…

Hello mr. Scotty. I have opel zafira 2001. 74 kw 2.0 TDI and it starts badly in the morning when temperature is low. I have Check engine light on and p1635 code. I've changed all the glow plugs and the glow plug relay, and still it starts badly. Maybe you could give me an insight on what else could it be. I will await for your response.

Sincerely

Martynas Chmieliauskas

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