"We also lack spare parts, causing an even bigger delay in repairing the car," said Coronel, who also expressed doubts that the car would turn a wheel before qualifying on Saturday afternoon.
"Despite all efforts by ROAL Motorsport to get the car ready in time, we will probably not make it to the free practice, meaning that the shakedown of the car is scheduled for the qualifying sessions, which is not the most ideal preparation for Sunday's races.
"But we will have to deal with that, and I'm already satisfied being able to race again in Hungary."
Coronel noted that the WTCC's compressed early-season schedule of four races in five weekends had presented ROAL with a daunting task of readying the car for Hungary.
"RML did a fantastic job. It was quite a challenge to transport the car from Marrakech via Paul Ricard to RML's workshop in Wellingborough, where they completely repaired the body in just three days," said Coronel.
"Last Sunday evening the structure arrived at ROAL Motorsport in Italy, where Roberto Ravaglia's guys immediately jumped on it and started rebuilding it.
"Respect for the way how everybody is doing his utmost to get me racing again this weekend."
Volvo gave the World Touring Car Championship a major boost when it announced it would enter the series, but its ambitions don't stop there. JACK COZENS examines its programme, the S60 and what its arrival means for the WTCC
The 2012 World Touring Car champion says he never had the money to race cars. Yet 2015 is his 11th season in the WTCC. He talks STUART CODLING through his journey from motorsport fan to paid professional - for little more than £100,000