Here is an extract from a technical bulletin to consider:
Diesel engines - Lack of power, jerking
Complaint: Lack of power, jerking
Cause: Air flow meter gets dirty or damaged because of water and oil, which drains through air inlet, air cleaner.
Production: Modified air mass meters have been introduced as of following VIN: Corsa C: Zaragoza: 08.05.01 W0L0XCF0814245493, Eisenach: 03.05.01 W0L0XCF6816105048, Azambuja: 25.05.01 W0L0XCF0813037404 Astra G: Bochum: 27.04.01 W0L0TGF3512245739, Antwerp:26.04.01 W0L0TGF4815248465, E'Port: 27.04.01 W0L0TGF3518127674 Zafira: Bochum: 06.04.01 W0L0TGF7512227609 Vectra B: Rüsselsheim: 27.04.01 W0L0JBF3511132832, Luton: 04.05.01 W0L0JBF6817066219 Omega B: Rüsselsheim: 04.05.01. W0L0VBP6911123565 Frontera B: Luton: W0L06BG761V500551 All hot film mass air flow meters with a stamp 183 (= March 2001) or lower have to be replaced.
Remedy
In case of customer complaint replace hot film mass air flow meter which has a stamp 183 (= March 2001) or lower.
Check the stamp on the right side of the connector socket of hot film mass air flow meter.
The first three digits of the stamp are describing month and year
of production, e. g. 088