When shopping for a used vehicle, especially one with a four-cylinder engine, it’s important to look beyond the sticker price. Many budget-friendly vehicles offer excellent fuel economy, but not all engines age gracefully.
One of the most catastrophic engine problems is rod knock — a deep, metallic-sounding issue that signals bearing failure and could lead to total engine destruction. Some cars are known for their solid engineering and are virtually immune to this, while others have become infamous for their engine failures, recalls, and driver complaints.
In this article, we explore five used vehicles that are praised for their engine reliability and five that are known to be rolling mechanical risks.
5 Used Cars With Zero Rod Knock Risk
These five vehicles are respected not only for their fuel economy and performance but also for their impressive track records of engine durability and reliability.
1. Toyota Prius (2014)
The 2014 Toyota Prius epitomizes the kind of reliability most used-car buyers dream of. Powered by a 1.8-liter four-cylinder engine working in tandem with a gas-electric hybrid system, the Prius is capable of an incredible 50 mpg in the city, 46 mpg on the highway, and a combined rating of 48 mpg.
But beyond its fuel economy, this model shines for dependability. According to J.D. Power’s 2017 Vehicle Dependability Study, it led the compact car segment, outperforming even the dependable Honda Civic.
The Prius’s hybrid powertrain is known for long-term durability with very few complaints about serious engine issues, making it an excellent choice for avoiding rod knock risk.

2. Honda Accord (2016)
The 2016 Honda Accord showcases the brand’s enduring commitment to engineering reliable, efficient sedans. It comes with a four-cylinder engine producing 185 horsepower and 181 lb-ft of torque, which translates to up to 36 mpg on the highway.
The 2016 model brought in major tech upgrades, including Android Auto and Apple CarPlay, and safety advancements through Honda Sensing.
Despite the inclusion of so many features, the Accord maintained its reputation for mechanical simplicity and durability. With few reported engine problems and a long lifespan under regular maintenance, the Accord is a safe and smart bet for used car buyers.

3. Chevrolet Malibu (2015)
The 2015 Chevrolet Malibu remains one of the more underrated choices for a reliable mid-size sedan. It comes standard with a 2.5-liter four-cylinder engine offering 196 horsepower and 186 lb-ft of torque, achieving 29 mpg combined.
There’s also an optional 2.0-liter turbocharged engine pushing out 259 horsepower while still managing decent fuel economy. With top predicted reliability marks from Consumer Reports and modern features like an onboard Wi-Fi hotspot, the Malibu is as practical as it is dependable. Neither engine has a history of premature failure or widespread complaints, making this a trustworthy pick for daily driving.

4. Subaru Impreza (2015)
The 2015 Subaru Impreza is a standout in the compact car segment thanks to its all-wheel drive and distinctive boxer engine. Its flat-four 2.0-liter engine provides 148 horsepower and 145 lb-ft of torque, helping the Impreza maintain a combined EPA rating of 31 mpg.
Boxer engines contribute to a low center of gravity, which enhances handling and stability. This model year also introduced Subaru’s EyeSight safety system.
With very few engine-related complaints and a superior predicted reliability rating from Consumer Reports, the Impreza avoids the kind of wear that leads to rod knock and is ideal for buyers who want confidence and safety in all seasons.

5. Hyundai Elantra (2014)
The 2014 Hyundai Elantra proves you don’t need to spend a fortune to get a reliable and efficient car. It comes with either a 1.8-liter or a direct-injection 2.0-liter four-cylinder engine, with the latter available in the Sport trim, making 173 horsepower.
The Elantra achieves up to 37 mpg on the highway and offers features like leather seats, heated front and rear seating, LED lighting, and a rearview camera. With high marks for predicted reliability, a 2014 Top Safety Pick designation, and no recurring engine issues or recalls, the Elantra offers long-term peace of mind at an accessible price.

5 Used Cars That Are Engine Time Bombs
In contrast, these vehicles may seem appealing at first glance, but are known for engine-related problems ranging from repeated stalling to complete engine failure, and in some cases, even fire risks. These are used cars to avoid.
1. Jeep Cherokee (2015)
On the surface, the 2015 Jeep Cherokee presents as a stylish and capable SUV, but a deeper look into its reliability reveals a troubling pattern. With 180 complaints to the National Highway Traffic Safety Administration (NHTSA), this model has reported problems ranging from engine stalling to faulty powertrains and electrical failures.
Several drivers have cited issues with the propulsion system suddenly cutting out. These types of problems are red flags for serious internal engine issues and make the Cherokee a risky proposition for those concerned with reliability.

2. Ford Fiesta (2013)
Despite its compact size and budget-friendly pricing, the 2013 Ford Fiesta has earned a notorious reputation for poor engine and transmission reliability. According to the NHTSA, there are over 100 engine complaints, many related to severe power loss or engine stalling around 60,000 miles.
Drivers have also highlighted problems with the powertrain and transmission that affect overall driveability and long-term function. Such a high rate of early failure significantly increases the risk of major engine issues like rod knock, making this model one to steer clear of.

3. Volkswagen Passat (2013)
Though the 2013 Volkswagen Passat was initially praised for its spacious interior and ride comfort, it has developed a record of mechanical unreliability. More than 100 engine complaints have been filed, with multiple issues linked to the propulsion system and speed control.
A major recall for over 84,000 vehicles warned of a potential grease leak, increasing the risk of engine fires. These engine-related defects paint a concerning picture for anyone considering a used Passat from this model year.

4. Chrysler 200 (2012)
The 2012 Chrysler 200 is one of the most frequently criticized used vehicles for engine reliability. With 145 complaints on record about the engine — and 16 additional ones for engine cooling — this vehicle has a worrisome track record.
One of the more serious recalls was related to rod bearing failure, which could cause the engine to seize without warning, putting drivers at risk of being stranded or crashing. Given these mechanical failures, the 200 is an engine time bomb that buyers should avoid.

5. Dodge Journey (2010)
Finally, the 2010 Dodge Journey is among the worst offenders when it comes to engine reliability. It has amassed 176 engine complaints, many of which detail severe problems like the engine shutting down while driving, components melting, or even catching fire.
The frequency and severity of these reports — including claims of internal engine parts overheating or disintegrating — put this model in the danger zone. If you value engine durability and driver safety, this is a vehicle to cross off your list.

Not all used cars are built equally, and some have the potential to cause massive repair bills or even safety risks. Thankfully, well-engineered models like the Toyota Prius, Honda Accord, and Hyundai Elantra continue to stand out for long-term reliability and fuel-efficient performance.
On the other hand, models like the Chrysler 200, Dodge Journey, and Jeep Cherokee have shown patterns of serious engine problems that are hard to ignore.
Doing thorough research and learning from consumer feedback and official reports can save you money, stress, and time, and help you avoid driving straight into mechanical trouble.
Also Read: 5 Cars With Best Fuel-Economy Displays And 5 Misleading Gauges