SOPs take the variables out of communicating service options
State inspections don’t offer standards for repairs. They only provide component safety inspection pass or fail guidelines. The decision-making tree for most vehicle repairs and maintenance are considerably more subjective. The repairs required by the results are as close to defined as it gets.
For example, we can agree that at some point the play in a steering or suspension component could reach a point of a potential separation failure or a dangerous driving dynamic that makes the vehicle unsafe. The engineers who designed the component often supply that limit as a “safety spec,” i.e., .040” of allowable movement; more than that requires replacement. As technicians we don’t have the data to make up our own spec, so we rely on our judgment based on experience. Most technicians wouldn’t even consider less than say, .020” acceptable, even though it’s well within specifications. Use a documented SOP to communicate to the customer that your service recommendation is based on your shop’s experienced judgement, not on a known safety standard.
Another example: when performing a routine wheel alignment, a technician might need to adjust an angle influenced by a component near the maximum spec or near the end of its useful life. A documented SOP would explain to the customer that replacing that component is recommended for proper alignment and to optimize tire life. The SOP text should also communicate that if it’s not replaced, it’s likely the component will not meet safety standards at some point during the time between today’s alignment and the next state inspection—an interval as long as two years in certain states.
Similarly, a standard operating procedure for “go/no go” scenarios like this should also be based on a qualified perspective on when labor time is worth investing and when it isn’t. Although some experienced techs may opt not to invest the time to take measurements because they know the part will fail anyway, they should follow their state inspection laws.