What are 171 and 174 code on maintaince - 2001 Ford Explorer Sport Trac

Thinking those are for the reset on the maintaince light ,so,
no. Unless the maintaince system light runs.

P0014 Camshaft position B over advance,or system performance bank 1.Clear the code,This appeared from either logic or rational.Camshaft postion usually appear on vehicle that are not in oil maintaince,this sensor has a tendency to get sluge built in it.This also appear when driver run the fuel very low,clear the code if it reappear its a hard code and a replacement or a service (clean it with gas or carb cleaner)it. is the solution

Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 2 is generally the side of the engine that doesn't have cylinder #1.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
I hope this helps.

The codes you show are all about air leaks. The 507 is about the IAC and may simply be the system noting the connection was unplugged.

The 171,174 are lean codes and usually mean more air is coming in than is needed. Did you use a water mist to check for leaks? Have you checked Vacuum solenoids for leaks?, the EGR diaphram?

You did not indicate the engine and vehicle this problem was on. Some of the 6 cylinder products had sandwich type manifolds and the upper and lower chambers had a gasket which would dissolve and leak internally.

Some people have had problems with the runners on dual plane manifolds, but I question whether a 171, or 174 could generate from this defect.

I think you should retest with a water spray after clearing the computer.

general maintaince does not include replacing the timing belt, the belt should be replaced at 80,*** miles.

No this means there is a emissions failure , you may or may not notice any symptoms , but your vehicle will require having the codes checked to determine which system is seeing a fault.

that is the engine management system checking itself,thats what its supposed to do.

It will tell you how in the owners manual if you have one. If not, try turning your ignition key to the on position without starting the car and press on the brake pedal 5 times in a row.

first buy a maintence manual chiltons or haynes , the with a computer car checker check the trouble codes the maintaince manual will have the codes listed and can show you how to read them and what to tell the dealer if it requires a repair facility.

O2 SENSORS ARE BAD MOST LIKELY I WOULD CHANGE THEM DISCONNECT THE BATTERY FOR 5 MIN. ( IF YOU DONT HAVE A SCANNER) THIS WILL RESET YOUR COMPUTER AND SHOULD MAKE THE SERVICE ENGINE LIGHT GO OUT.