Q: How many times can a mechanic charge a diagnostic fee for the same problem?

asked by on August 12, 2017

I used a mobile mechanic to try to fix my car so that I could pass emissions. He charged about $400 for the work. I asked if my car would pass emissions and he said yes. I told him that my check engine light came back on the next day and asked if he could come back out. He said to take my car to autozone to get the codes read and then he would. If he had to come to me to read the codes he would charge another diagnostic fee. Is it normal for him to charge another fee when the problem wasn't fixed in the first place?

Check Engine Light is on Inspection $94.99 - $114.99 Get a Quote

The fee charged, $400, does suggests a "significant" repair which obviously you hoped would cover everything and would result in the light staying off. To answer your question as to the appropriateness of "new" diagnostic or repair charges, I would still need to know exactly what the original trouble codes were, exactly what was replaced or repaired, and why, and what the new codes are. The problem is there are many, many different and unique scenarios that can arise in repairing vehicle systems and one of those possibilities is that the "new" codes have absolutely nothing to do with the original issue but rather represent new malfunctions. Obviously, if new malfunctions are occurring that’s not the mechanic’s fault and "new" diagnostic charges would be reasonable. The bottom line is much more information is needed to understand your circumstance and guide you. If you wanted to resolve the issue using a certified mechanic dispatched by YourMechanic, the recommended service is a check engine light diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you to get the best possible results.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Car shutting off even with a new fuel pump.
In my experience I would recheck the fuel pump again since if it fixed the problem only a short period of time, then the new part may be defective. The fuel pressure test would let you know if it is...
Car starts up and cuts off after a while of driving
This may be likely related to a fuel pump issue (https://www.yourmechanic.com/services/fuel-pump-replacement) or lack of fuel pressure. Low fuel pressure is something that can cause your car to struggle to idle (https://www.yourmechanic.com/services/car-idle-is-rough-inspection) or even stall (https://www.yourmechanic.com/services/car-is-stalling-inspection) when driving. This will also...
My car has high miles and tonight it began "missing" and the engine does not seem as "smooth" as usual.
Hello. The symptoms you describe can be caused by a wide variety of issues. If the Check Engine Light has come on, then I would recommend retrieving the trouble codes as the possibilities could be many. Issues with the fuel...
Check Engine Light - 2013 Chevrolet Malibu
Hi there: Sometimes minor fender bender can trigger other issues to appear, especially if a loose sensor or wire was damaged during the incident. If the engine is making a weird sound while the heater is active, it's possible that...
3100 v6 on 2003 buick century lacks power under acceleration, spits and sputters, hard to get up to speed
If your vehicle is hesitating upon acceleration, it is possible that you have a fuel issue. Some of the potential causes of this issue would include a faulty fuel pump (https://www.yourmechanic.com/services/fuel-pump-replacement), faulty fuel pressure regulator (https://www.yourmechanic.com/services/fuel-pressure-regulator-replacement), or a clogged fuel...
no start
When the engine cranks but does not start, this is usually related to a fuel or ignition issue. Since this engine has a distributor, I would recommend checking the distributor, distributor cap, and rotor (https://www.yourmechanic.com/services/distributor-replacement) for any damages. Then I...
Clunking noise when coming to a stop
If you have the 4WD version of the truck with CV axles in the front, a possibility is a faulty outer CV joint. Such can often be detected on visual exam and with simple tests. Failure of the outer CV...
I have brown goo in my radiator and there's brown on the cap
Hello there. The brown sludge you are referring to is often caused by rust or breakdown of the metallic and rubber components that comprise your cooling system. It is common for this to occur when a radiator and coolant lines...
Can a bad neutral safety switch affect shifting?
Hi There, It sounds like you may have a problem with the neutral safety switch. Your vehicle has a neutral safety switch (https://www.yourmechanic.com/services/neutral-safety-switch-replacement) that will prevent the vehicle from starting when it is in any gear position other than park...

Related articles

Smart Certified Pre-Owned (CPO) Car Program
Shopping Shopping for a used Smart vehicle often leads many drivers to consider certified pre-owned options. Smart is one of many manufacturers that have a certified pre-owned (CPO) program. Each car manufacturer structures their CPO program differently; read on to...
P0413 OBD-II Trouble Code: Secondary Air Injection System Switching Valve A Circuit Open
P0413 means theres a issue with the vehicle’s air injection system due to faulty air injection pump, faulty wiring or faulty air bypass solenoid.
P0871 OBD-II Trouble Code: Transmission Fluid Pressure Sensor/Switch C Circuit Range/Performance
P0871 means there is an issue with the transmission fluid pressure, possibly that it is low, the pump is faulty, or the sensor is dirty.