A retest will be required, the engineer will go through the failure points with you at the time of inspection followed by a failure report sent via email 5 working days after inspection. Once these areas have been rectified, you will need to rebook your vehicle in for re-inspection. If the vehicle fails and requires a retest, as along as the vehicle is brought back within 30 days, the retest fee is between £80 and £100. Over 30 days, the car will need a full inspection at the full current inspection cost.