Check engine Light

Brake Light. Make sure you are not driving with hand brake on. Check brake-fluid level. Top off brake fluid if low and make appointment to check brakes. Driving with brake light can be dangerous; deal with this soon. Call tow truck or drive carefully and slowly to shop.
ABS (antilock brake system) Light. Indicates either low brake-fluid level, stuck brake caliper or faulty ABS. Check brake fluid and make appointment to get brakes checked. Call tow truck or drive carefully and slowly to shop.
Oil Light. Either engine is very low on oil or there is no oil pressure. Pull over and turn off engine immediately. Check oil level and add oil if low. Turn engine back on to see if light has gone off. If oil light is still on, bad oil pump (no oil pressure) is likely. Call tow truck.
Check Engine Light. Car's computer senses engine problem. Difference in performance may not be noticeable, but make appointment to have car diagnosed. This usually cost around $65-$75 to do. OK to drive. If problem is serious, computer may switch to limp-home (low-power) mode and you won't have option of waiting to bring car into shop.
Air Bag Light. Get air bags checked. Problem could prevent them from activating in accident. OK to drive, but not safe in accident.
Battery Charge Light. Alternator is not charging. OK to drive, but turn off any unneeded electrical devices (radio, heater, defroster) and avoid starting engine more than necessary. Bring car into shop soon to avoid getting stranded. When alternator is not charging, battery loses charge and car stops working.
Emissions Lights (O2 sensor, EGR, check emissions). Depending on car model, these lights may indicate problem with emissions sensor or may light up at certain mileage, usually 60,000 miles (100,000 km). Get sensors checked. OK to drive. If problem exists, car might get poor gas mileage.
OBD Tools 365 Days Shop

check all fliud levels antifreeze/oil/power steering/ transmission/even washer fluid.. as some have level switches on them.. these will cause your light to activae also..

No Bad o2 But Check oil Level. How old Was The oil That Came Out? Fresh oil Will Clean Out Sludge Deposits If The oil Was'nt Changed In A Timely Manor It could Have caused leaks. also Check Drain Plug Gasket for leaks And Make Sure Oil Filter Is Correct And Tight.

fuel filter,module.

The most likely cause of check engine light is the o2 sensor.

low oil would normally set off an individual warning.. either way when You topped off the oil it would automatically reset the light.. the check engine light comes on when an electrical component sends a signal, the best thing is to take your car to a qualified mechanic so he can use his scan tool to get the code from your car. It could be most anything from an O2 sensor (the typical first engine check light) to your cars computer..

Sounds like you may be passing moisture to the O2 sensor. #1 make you sure you are using a GOOD grade of Gasoline. You may need to add a bottle or 2 or DRI-gas to you gas tank. A good bottle of LUCAS fuel treatment wouldn't hurt at this point either.

P1259 is a code for vtec malfunction usually cause by a bad vtec solenoid, vtec pressure sensor, low oil level, bad connection. Was oil change done? May want to check the oil level. P1166 is a code for a primary o2 sensor 1.

It seems like the gas, but the more likely causes could either be a gas tank cap not sealing, and or the O2 sensor needs cleaned or replaced. There is not enough of a difference in the octane levels in the gas to cause a check engine light.

This could be an O2 sensor or sometimes with lower grade gasoline I have seen different cars act this way. If the O2 is not bad try mid to super gas or fuel system treatment/cleaner to see if there is a change. I know in my area there is mostly 10% ethanol which will lower octane. I hope this helps!