BMW driver Marco Wittmann was stripped of his first DTM victory in 2017, leaving Audi with a top-four lockout in the Sunday race at Zandvoort.
Reigning series champion Wittmann had seen off Audi's Mike Rockenfeller in a closely-fought battle, taking the flag eighth tenths ahead of his rival.
But his car was held in parc ferme after the race and he was disqualified, as the organisers were unable to take a 1kg sample of residual fuel from his car.
As such, Rockenfeller was promoted to race winner, with Loic Duval moving up to runner-up and Mattias Ekstrom inheriting a podium – despite the Swede having finished almost a full minute behind Wittmann.
The disqualification is a heavy blow to Wittmann's chances of successfully defending his 2016 title, as the initial win had allowed him to emerge as one the chief title contenders.
He provisionally sat just seven points off championship leader Ekstrom, but is now down to eighth place in the standings with six races left to run.
Rockenfeller's victory is his first since 2015, and puts him third in the standings as he props up an Audi 1-2-3. He is now on 110 points to Ekstrom's 128 and Rast's 114.
|1||Mike Rockenfeller||Audi RS5 DTM||56'33.404|
|2||Loic Duval||Audi RS5 DTM||56'49.985|
|3||Mattias Ekström||Audi RS5 DTM||57'31.477|
|4||Nico Müller||Audi RS5 DTM||57'32.024|
|5||Gary Paffett||Mercedes-AMG C63 DTM||57'32.252|
|6||Maxime Martin||BMW M4 DTM||57'32.794|
|7||Timo Glock||BMW M4 DTM||57'33.332|
|8||Augusto Farfus||BMW M4 DTM||57'33.473|
|9||Jamie Green||Audi RS5 DTM||57'35.809|
|10||Bruno Spengler||BMW M4 DTM||57'45.413|
|11||Maro Engel||Mercedes-AMG C63 DTM||58'03.531|
|12||Edoardo Mortara||Mercedes-AMG C63 DTM||58'04.165|
|13||Tom Blomqvist||BMW M4 DTM||58'04.682|
|14||Lucas Auer||Mercedes-AMG C63 DTM||1 lap|
|Ret||Robert Wickens||Mercedes-AMG C63 DTM||4 laps|
|Ret||Paul di Resta||Mercedes-AMG C63 DTM||-|
|Ret||René Rast||Audi RS5 DTM||-|
|DQ||Marco Wittmann||BMW M4 DTM||-|