Is it OK to drive with an exhaust leak?

Driving with an exhaust leak is not safe. Even a small leak can allow carbon monoxide to seep into the cabin, posing a serious health risk, and it can also affect engine performance and emissions. If you suspect a leak, have it repaired promptly and avoid extended driving until it's fixed.

What an exhaust leak is and why it matters

Exhaust leaks occur when joints, gaskets, pipes, or the manifold are compromised, allowing exhaust gases to escape before they reach the tailpipe. Leaks can occur at the manifold, catalytic converter connections, mid-pipes, clamps, hangers, or the muffler. Depending on where the leak is, it can alter engine readings, reduce efficiency, and, more importantly, expose occupants to harmful gases. Leaks before the oxygen sensors can upset the engine’s air-fuel mixture, while leaks after the sensors can allow gases to escape into the cabin.

Common sources of leaks

Most leaks arise from wear, corrosion, or damaged hardware. Common trouble spots include the exhaust manifold gasket, downpipe connections, clamps and hangers, flex joints, and damaged heat shields.

Signs that your exhaust may be leaking

Detecting a leak early can prevent health risks and costly repairs. Look for these telltale signs that the exhaust system may be compromised.

• Loud or unusual exhaust noises, such as roaring, banging, or hissing


• Raspy ticking or high-pitched sounds near the engine or undercarriage


• Visible smoke, soot around joints, or rusted/damaged pipes


• Strong exhaust smell inside the cabin or a persistent odor of exhaust outside


• Sudden drop in fuel efficiency or changes in engine performance

If you notice any of these signs, avoid long trips and have the vehicle inspected as soon as possible. A leak can worsen quickly and increase exposure to exhaust gases in enclosed spaces.

Health and safety risks

The main danger from an exhaust leak is carbon monoxide exposure. CO is colorless and odorless, and it can accumulate inside a vehicle, particularly in closed or poorly ventilated spaces. Symptoms of CO exposure include headaches, dizziness, confusion, nausea, and fatigue. People in cities with heavy traffic or who routinely park in garages are especially at risk. There is also a fire risk if hot exhaust components come into contact with flammable materials, and leaks can affect emissions controls and engine performance.

• Carbon monoxide poisoning risk to occupants


• Fire risk from hot exhaust components near flammable materials


• Potential impact on engine management and emissions readings


• Possible damage to catalytic converter if leak compromises sensors or hot zones

Because CO exposure can be deadly in enclosed spaces, treat any suspected exhaust leak as a safety issue and address it promptly.

Is it safe to drive a car with a suspected leak?

Generally, it is not safe to drive with a known exhaust leak. If you must move the vehicle for safety or to reach a repair shop, limit driving distance and avoid idling in enclosed areas. If you experience symptoms of CO exposure, pull over immediately, ventilate the cabin, and seek medical help.

• Do not drive long distances; arrange tow or roadside assistance


• If you must move the vehicle, keep speeds low and windows open to improve ventilation


• Avoid parking in enclosed spaces like garages or tunnels while the leak is unresolved


• Have the exhaust system inspected and repaired by a qualified mechanic as soon as possible

Your safety and the integrity of the vehicle’s emissions system depend on timely repair of an exhaust leak. A professional assessment will determine the location and severity and recommend the proper repair.

What to do right now if you suspect an exhaust leak

If you suspect a leak, take these steps to minimize risk and arrange for repair.

• Pull over safely and turn off the engine if you notice strong fumes, loud noises, or CO symptoms


• Do not attempt to seal the leak yourself with tape or makeshift fixes; professional repair is required


• Tow the vehicle to a repair shop or call roadside assistance


• Ventilate the cabin by opening windows if you must drive a short distance


• Have the exhaust system inspected for leaks, rust, holes, or damaged components

Addressing an exhaust leak promptly helps protect occupants, prevents further damage to the exhaust and emissions system, and ensures the vehicle remains safe to operate.

Summary

Exhaust leaks are a safety and health concern, not a minor nuisance. They can allow dangerous carbon monoxide into the cabin, pose a fire risk, and impact engine performance and emissions controls. If you hear unusual noises, smell exhaust fumes inside the car, or see visible damage to the exhaust, stop driving as soon as safely possible and seek professional repair. When in doubt, err on the side of safety and arrange a tow to a qualified mechanic. Prioritizing a timely fix protects you, your passengers, and your vehicle.

Will an exhaust leak hurt my engine?

Yes, an exhaust leak is bad for your car because it can be dangerous for your health, cause significant engine damage, and lead to decreased performance and expensive repairs. Leaks can allow toxic gases like carbon monoxide to enter the passenger cabin, disrupt the engine's air-fuel mixture, and lead to costly damage to other components. 
Health and safety risks

• Toxic gas exposure: The most serious risk is that deadly, odorless carbon monoxide can leak into the cabin, causing dizziness, nausea, or even death. 
• Increased fire risk: Depending on the location of the leak, it could potentially cause a fire if it comes into contact with other components. 

Vehicle and engine damage

• Engine damage: An exhaust leak can cause excess heat to damage crucial engine components like valves and sensors, potentially leading to expensive repairs. 
• Performance issues: Leaks can disrupt the air-fuel mixture and trigger the check engine light, leading to poor fuel efficiency, reduced power, and rough idling. 
• Component failure: Over time, leaks can cause corrosion and damage to other parts of the exhaust system, such as the catalytic converter. 

Legal and environmental issues

• Emissions tests: Your car may fail its emissions test if it has a leak, which can result in fines or the inability to register your vehicle.
• Environmental impact: A leaking exhaust system releases harmful pollutants into the environment. 

You can watch this video to learn about the signs of an exhaust leak: 55s8020 AutomotiveYouTube · Jun 23, 2024
What you should do

• If you notice any signs of an exhaust leak (loud noises, strange smells, or the check engine light), have it inspected and repaired by a professional as soon as possible.
• Ignoring the problem will likely only lead to more extensive and costly damage. 

This video explains if you can drive with an exhaust manifold leak: 1mMercie J Auto Care, llcYouTube · Feb 6, 2024

What is the average cost to fix an exhaust leak?

The cost to repair an exhaust leak varies significantly, from around $100 for a simple patch or weld to potentially over $2,000 for replacing larger components like a catalytic converter or a whole system. Factors like the leak's location, the extent of the damage, and the specific parts needed (gaskets, pipes, catalytic converters) will determine the final price. Simple fixes like patching a small hole are the cheapest, while more complex jobs involving multiple parts or difficult-to-reach areas will be more expensive.
 
Cost factors

• Location: Leaks near the engine (like an exhaust manifold leak) are often more expensive to fix than those further down the exhaust pipe. 
• Severity of damage: A minor leak might be fixed with a simple weld or patch, while severe rust or a large crack may require replacing an entire pipe section or component. 
• Type of repair:
  • Patching or welding: The cheapest option, often costing between $75 and $100 for simple fixes. 
  • Replacing a gasket: Can range from around $20 for the part to $400 for a dealership to fix an exhaust manifold leak. 
  • Replacing a pipe: More expensive, with quotes ranging from $800 for a single pipe to over $1,700 for a whole tailpipe section. 
  • Full system replacement: This is the most expensive option, potentially costing $500 to $1,500 or more for major components like the catalytic converter. 
• Labor costs: Labor costs vary by location and shop, but labor alone for a simple patch might be around $65-$100, while more complex jobs could be significantly higher. 
• Part availability and vehicle model: The cost of parts, such as a gasket or pipe, can vary depending on the make and model of your car and whether you use OEM or aftermarket parts. 

Getting a quote

• Get multiple quotes: It is recommended to get quotes from several different types of shops, including exhaust specialists and general mechanics. 
• Ask for details: When getting a quote, ask the mechanic to be specific about what they plan to do (e.g., patching, welding, or replacing) and what parts they will use. 
• Ask about guarantees: It is a good idea to ask if the repair comes with a guarantee for a certain period or mileage. 

DIY options

• For a simple patch, a DIY repair kit with a heat-activated wrap can cost as little as $12, but it requires some mechanical knowledge and the repair may not be as durable as a professional one. 

Can I drive my car if the exhaust is blowing?

No, it is not recommended to drive with a broken exhaust, as it can be dangerous and lead to costly repairs. Driving with a broken exhaust poses risks including exposure to toxic carbon monoxide, increased fire hazards, and a loud, uncomfortable ride. It is best to have a broken exhaust system professionally repaired before driving the vehicle.
 
This video explains the dangers of driving with a broken exhaust, including carbon monoxide poisoning and fire risk: 56sMercie J Auto Care, llcYouTube · Feb 6, 2024
Dangers and risks

• Toxic fumes: A broken exhaust can allow poisonous gases like carbon monoxide to enter the cabin, which can cause disorientation, unconsciousness, or even death. 
• Fire risk: Excess heat from a leak can ignite nearby flammable components under the car. 
• Reduced engine performance: A damaged exhaust can disrupt the engine's back pressure, leading to decreased power and poor fuel efficiency. 
• Further damage: The breakage can cause other parts of the exhaust system to become more damaged or fall off completely. 
• Noise and discomfort: A broken exhaust is often very loud and can cause vibrations, making for an unpleasant and potentially distracting ride. 
• Legal issues: Excessive noise or visible smoke can result in tickets and fines in some areas. 

What to do instead

• If the car is drivable, try to get it to a repair shop immediately. 
• If the damage is severe or the part is dragging, do not drive it. 
• Call for roadside assistance or have your car towed to a mechanic to avoid potential harm and further damage. 

Is fixing an exhaust leak worth it?

Fixing minor issues promptly can save you money in the long run. Vehicle Performance: An efficient exhaust system contributes to your vehicle's overall performance, fuel efficiency, and engine longevity. Timely repairs help maintain your vehicle's optimal performance.