1996 Honda Accord Running lean after changing tune up and new oxygen sensors.

http://www.obd-codes.com/trouble_codes/ here features your problem codes. 401 is an EGR or exhaust gas recirculation problem. saying exhaust gas is not getting back to the intake. this is almost a non issue. its there purely to help reduce emissions by your vehicle and a by product is actually more heat being shunted back to the motor and less power as bad gas gets mixed with good oxygen. the other is an oxygen sensor malfunction. this is concerning as the computer may be telling the engine to "Lean out" the fuel. pushing less fuel into half or all of the engines cylinders and when it burns it burns much hotter than a "rich" mixture. head to this link and start checking your engine for loose, cracked or damaged little black hoses called vacuum lines. http://www.obd-codes.com/p0171 that is likely why your engine cooked. the mechanic may have spilt oil onto the sensor too.

yes those are an issue, not as major as a blown motor, but still an issue. the vss ( vehicle speed sensor )is located on the transmission and is fa easy to replace.the o2 sensors tell the cars computer if it is running lean ( too much air ) running rich ( too much fuel ) so if you have a bad o2 sensor your car may think it is running lean so it may reduce amount of air or increase the amount of fuel. a bad o2 sensor will reduce your fuel mileage quit a bit. hope this helps, let me know

did you already run an OBD 2 scan?(free at most parts shops)

Probably an 02 (oxygen) sensor or maybe a vacuum problem as simple tightening your gas cap. There are two 2 sensors in most cars so you have to figure out which one it is, or bring it to the service station. You can't pass inspection in most states with the "check engine" light on.

If you are near a chain auto parts store, they may reset your computer free; call them.
Running 'lean' means the fuel-air mixture is not ideal and the amount of fuel being injected is less than it should be relative to the air coming in. Running rich is the opposite. A lean burn can cause excessive heat and do some damage if extreme enough. The discoloration of the spark plugs will sometimes show this condition by having deposits that are a bit too light; they should normally show a beige or light brown coating after some miles are on them.
I think the computer should somewhat compensate for a dirty air filter but it wouldn't take long to check it.

o2 sensor is very important part to the engine when it come to the fuel economy. o2 sensor send information to the computer (ECU) which compute and calculate ratio of burnt exhaust gases. if the engine is not run properly either is too lean or too rich the o2 sensor will detect it as the car will triger the check engine light. you can drive the vehicle which will not hurt it as long you can tolerated the light however the car will get terrible gas mileage and poor performance as the ECU will try to lean the engine out itself. o2 sensor is fairly cheap to replace and fix. Let assume the car get 30 mpg on the high way, running with check engine light/bad o2 sensor will change the gas mileage to 18-25 mpg. If the car is V6 make sure you replace o2 on both side. good luck!

you need to doule check the cable is inserted fully into housing.pull up slightly on cable(at trans)it will be snug or will very easily pull out. if pulls out it clip retainer was not locking cable in place.

look at oxygen sensor.look at egr control solenoid.

Hi,welcome to fix ya.
p0171 is for a lean fuel condition .A variety of things can cause this code the most common one is a bad o2 sensor but a plugged injector,fuel filter or dirty egr system can cause this as well.

try checking the air flow sensor and or oxygen sensors