The city and state comptrollers are teaming up to investigate the Metropolitan Transportation Authority.

John Liu and Thomas DiNapoli announced Thursday they will audit the MTA to determine if bus and subway service disruptions are always necessary, as well as the financial impact of those disruptions.

Additionally, they will look into whether riders are adequately informed of potential changes in service.

"We need to be sure that the MTA is doing all that it can to be sure that it is operating at maximum efficiency and limiting disruptions to the ridership and not dislocating those who use the services of the MTA," said DiNapoli.

"It makes perfect sense for us to combine forces to address an ongoing problem that too many New Yorkers have suffered through for too many years,” said Liu. “And the problem is simple, it's that the MTA seems so dependable when it comes to perennial service cuts and subway shutdowns...There's no explanation as to what is actually being done when the tracks are shut down, when the subway is taken out of service."

MTA officials said in a statement that they welcome the audit and they look forward to working with both comptrollers to ensure their investments are used as "effectively as possible."

"We've been working very hard to overhaul both what's in the capital program and how it is implemented, leading to a nearly $2 billion reduction in the plan that was submitted last month," said the MTA in a statement.

The audit is expected to take months to complete.

The move comes as the transit agency is preparing to implement a wide array of service cuts next month, including eliminating dozens of bus lines and two subway routes.

This is the first joint effort between the city and state comptrollers in 10 years.