Nearly half of drivers have a warning light on, check engine-related repair costs up 

Here’s a breakdown of the 10 most common check engine light-related repairs in 2023 and the average cost, including parts and labor

Irvine, Calif.—CarMD.com Corporation has released its 2024 CarMD Vehicle Health Index, an annual study of check engine light-related car repair trends. CarMD finds that more drivers are ignoring dashboard warning lights, and the cost to repair check engine light-related issues are up across all regions of the U.S., largely due to an increase in parts costs.

The following is a breakdown of the 10 most common check engine light-related repairs in 2023 and the average cost (including parts and labor) to make that repair: 

1. Replace catalytic converter(s), $1,304 
2. Replace oxygen sensor(s), $253 
3. Replace ignition coil(s) and spark plug(s), $398 
4. Replace mass air flow sensor, $311 
5. Replace ignition coil(s), $212 
6. Replace EVAP canister purge control valve, $141 
7. Tighten or replace fuel cap, free to tighten; $25 on average to replace (not in top five repairs for the first time) 
8. Replace ABS wheel speed sensor, $271 (new to the list this year) 
9. Replace fuel injector(s), $446 
10. Reprogram powertrain control module, $109 

Other findings from year’s CarMD Vehicle Health Index Check Engine Report: 

• More Drivers are Ignoring Dashboard Lights. In a recent survey of U.S. vehicle owners, CarMD found that nearly half (49%) reported having a dashboard warning light on. 22% reported having a tire pressure light on, which is understandable since the survey was conducted in January when cold temperatures can cause low tire pressure. The survey also found 20% reported their vehicle’s check engine light was on — this is nearly double the number from the last time CarMD surveyed drivers about their check engine light. 12% of respondents reported having an oil/maintenance light on, 11% had an illuminated anti-lock braking system (ABS) light, and 7% had a supplemental restraint system (SRS) air bag light on. (Source: Online survey of 1,250 US adults who own or lease a vehicle that is at least one year old. Survey conducted on behalf of CarMD by Veridata Insights 1/17/24 – 02/07/24). 

• Parts Costs Up. In 2023 car repair costs were up 5.1% overall, totaling $424 on average — an all-time high since CarMD began tracking check engine light-related car repair costs. Labor costs were only up 1%. But in a continuing upward trajectory, parts costs were up over 7%. Factors that likely played a role in this increase include more technology in cars, increases in the cost of consumer goods, and more expensive parts failing as vehicle owners hold on to their cars and trucks longer than ever before. 

• End of an Era. The gas cap is no longer one of the five most common check engine repairs. This marks the first time the gas cap has dropped out of the top five since CarMD started tracking check engine repairs back in 2011. 

• Vehicle Age Impacts Check Engine Light Problems. CarMD found that a model year 2007 vehicle is most likely to need a check engine light-related repair. 

The 2024 Index statistically analyzed more than 15 million failures and recommended repairs for vehicles in the U.S., over the previous calendar year. The data comes directly from each vehicle’s OBD2 system, reported by millions of vehicle owners and the professionals who service them. The failure and fix data are validated by CarMD’s network of Automotive Service Excellence (ASE)-certified technicians.