Service engine soon

Hello i recently purchased 2009 maxima preowned. The service engine soon light popped up so i got it checked with my local mechanic.
The codes are: P0014, P0024 & P0448
My mechanic did not know what the exact issue or how to fix it. My question is how bad are these and what is the problem and how to get them fixed. Also how much will it cost me to fix.
Thanks

My car has 90000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Codes P0014 and P0024 are related to the exhaust valve timing. The engine is equipped with variable valve timing. This system is oil pressure fed. It can vary intake and exhaust cam timing to allow the engine to make good power across a broad range of rpms. With age or infrequent oil changes, the solenoids (sometimes called cam phasers) that control the cam timing can become clogged, effecting oil pressure to the variable cam system. If the cam timing is out or range or inconsistent because of this, those fault codes will be set. Sometimes you can get away with a simple fix of multiple oil changes. You can try changing the oil and filter with a thinner oil and allow the engine to idle for 30-40 minutes. Then perform another oil and filter change with the proper oil. This can sometimes clear out the solenoids. If it does not work, replacement of the variable valve timing solenoids AND another oil change is the only fix. Fault code P0448 has to do with the Evaporative system. This has to do with venting fuel tank fumes and others into the intake system to be burned away during normal engine operation. The system is designed to operate in a specific pressure range. This fault code is set when the pressure is out of range. The fix can be as simple as a new gas cap, or get more involved like replacing the purge canister or purge valve. Both should be addressed as soon as possible for optimal performance. continued driving with the variable cam faults can cause more damage in the long run, reduce power and fuel economy.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

If the check engine light in your Nissan Maxima starts flashing, that means that the problem needs sudden attention and your Nissan should be transported in promptly. This blinking light usually indicates a severe engine misfire allowing unburned fuel to be dumped into the exhaust system.
A: When the “service engine soon” light comes on, it means exactly what it says – you should take your car to the mechanic for immediate service.
Basically, it is an emissions monitoring system. A Check Engine indicator will stay solid or blink. If the indicator is blinking, the situation is usually serious, such as a severe misfiring of the engine.
That having been said, you can probably drive safely with the service engine soon light on, as long as it is on solid and not flashing. If the service engine light is flashing, you should pull over immediately and call for roadside service and have the vehicle towed to the mechanic.
The “Check Engine” or “Service Engine Soon” light indicates there may be a repair or replacement of your engine or transmission. It means there is more than a routine repair or service requirement, and instead, a system failure to the fuel, transmission, ignition, or emissions.
In most cases, successfully repairing the issue that caused your light to come on will cause the check engine light to turn off automatically—but only after 10 to 20 “cycles”. A cycle, in this instance, refers to the process of turning the vehicle on, running it for some time, and turning it off again.
Once you see the check engine light, it is safe to drive with the light on for 50 to 100 miles. This is because if the issue is with the sensors, then this will buy some time for it to reset, turning the check engine light off. However, scan the computer for the appropriate error codes if the light remains.
The simplest explanation for the difference between a check engine light and service light is the former indicates a major problem and the latter indicates a need for maintenance or regularly scheduled service.
The simplest way to describe the difference is that the Service Engine light informs us of upcoming expected maintenance. On the other hand, the Check Engine light informs you of an unexpected problem occurring in your engine or exhaust system.
Once you see the check engine light, it is safe to drive with the light on for 50 to 100 miles. This is because if the issue is with the sensors, then this will buy some time for it to reset, turning the check engine light off. However, scan the computer for the appropriate error codes if the light remains.
The “service engine soon” light indicates that upcoming vehicle maintenance is due. This can indicate service is required for an oil change, air filter, or transmission fluid service. The “check engine” light (CEL) is more urgent than the service engine soon light.
Once you see the check engine light, it is safe to drive with the light on for 50 to 100 miles. This is because if the issue is with the sensors, then this will buy some time for it to reset, turning the check engine light off. However, scan the computer for the appropriate error codes if the light remains.

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