Vehicle systems warning signs — Iowa Permit Test

Vehicle systems warning signs on the Iowa permit test — 5 rules, each with the reason behind it and a question on it while it is fresh.

The rules

If the vehicle is hard to turn or does not turn when the steering wheel is first turned, have the steering checked by a mechanic.

Steering that lags can leave you unable to dodge a hazard or make a sharp turn in time.

If the vehicle is hard to turn or does not turn when the steering wheel is first turned, have the steering checked by a mechanic.

Iowa Driver's License Manual, p.25

If the vehicle bounces a lot, or keeps bouncing after a bump or after you stop, you may need new shocks or other suspension parts.

Worn shocks let the tires bounce off the road, and a tire in the air cannot steer or brake.

If the vehicle bounces a lot, or keeps bouncing after a bump or after you stop, you may need new shocks or other suspension parts.

Iowa Driver's License Manual, p.25

Fumes from a leaky exhaust can cause death in a very short time.

Exhaust gas has no smell you can count on, and it can fill a car or garage fast enough to kill.

Fumes from a leaky exhaust can cause death in a very short time.

Iowa Driver's License Manual, p.25

A poorly tuned engine may lose power needed for emergencies and could stall while you are on the road.

A car that stalls in traffic is a sitting target, and an engine with no power cannot get you out of trouble.

A poorly tuned engine may lose power that is needed for normal driving and emergencies, may not start, gets poor fuel economy, pollutes the air, and could stall on you when you are on the road causing a traffic problem.

Iowa Driver's License Manual, p.25

The horn should only be used as a warning to others.

If people hear horns for every little thing, they stop paying attention to the one that matters.

It should only be used as a warning to others.

Iowa Driver's License Manual, p.25

On the test

Which of these is a sign your steering needs a mechanic?

The car does not turn when the wheel first turns. Steering that lags can leave you unable to dodge a hazard or make a sharp turn in time. Iowa Driver's License Manual, p.25: “If the vehicle is hard to turn or does not turn when the steering wheel is first turned, have the steering checked by a mechanic.”

How this works

Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.

You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.

Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.

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Where these come from

Every rule here is checked against Iowa Driver's License Manual, published by the Iowa Department of Transportation, and against the state code itself. Last checked 2026-10-04.