This is what I find on their site.


For how long is the pass report valid?

Normally, a Drive Clean pass is valid for 12 months from the date of issue. There are a few exceptions:

Transfer of Ownership

A light-duty vehicle tested in order to transfer ownership does not require a test the following year to renew its registration, unless there is another change in ownership.

This means that a Drive Clean test done when buying a used car is good until the end of the next calendar year.

Example: If you bought a used car and had a Drive Clean test to transfer ownership on January 3, 2013, that car would not need a test for a 2014 registration renewal, provided there was no change in ownership. If you kept the car for several years, the car would not need to be tested until the car’s next scheduled registration renewal date – in this case, 2016.



Do I need a test if I’m buying or selling a used vehicle?

As a consumer-protection measure, used vehicles must pass the emissions test in order to transfer ownership if the model year is older than the current calendar year.

This requirement helps to ensure that consumers do not unwittingly purchase a used vehicle with emissions problems.

There are two exceptions to this rule:

When you are buying your car from a leasing company at the end of the lease
When you sell your vehicle to an immediate family member*. Immediate family members include your applicant’s:

parent
stepparent
grandparent
stepgrandparent
child
stepchild
grandchild
stepgrandchild
sibling
half-sibling
father-in-law
mother-in-law
son-in-law
daughter-in-law
brother-in-law
sister-in-law

Exemption forms for family transfers and lease buy-outs are available at ServiceOntario counters.

It is the responsibility of the buyer and the seller to determine who pays to have the vehicle tested. Cars manufactured before 1988 are not subject to Drive Clean testing.



From what I gather I would need a new test. But they don't specifically say how old the test can be for an ownership transfer.