The Mayor of London is being urged to extend the consultation period on the proposed western extension of the congestion charge zone.
The zone would be expanded into Kensington and Chelsea
The London Assembly Conservatives say it should be extended after a survey revealed 40% of affected households have not received consultation packs.
A motion will be proposed and debated during the Mayor's Question Time at City Hall on Wednesday.
The congestion charge boundary would extend into Kensington and Chelsea.
Conservative Congestion Charge spokesman Angie Bray said: "This is the last chance for the public to have their say on the proposed western extension.
"It is therefore essential everyone gets the relevant documents. Transport for London have clearly failed to do this, resulting in a flawed consultation process."
She said the consultation period should be extended while the situation is rectified.