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Service engine lite on Can it be from low octane gas

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It can also be called the " Check engine light ".
In order to turn off the "Check Engine Light", you or a trusted mechanic check the Onboard Diagnostics (OBDII) OBDII uses a "code reader" which plugs into your car (usually in the dashboard, or near the radio...) and that tells you what "malfunction" is setting your Check Engine Light off.
Basically, if there is a fault in any computer controlled system (fuel, ignition, SRS (airbag), emissions etc) the Electronic Control Unit (ECU) sends a code to the OBD unit... Then the code reader breaks down the fault, it's location and usually (with a good reference manual) you can remedy the problem (or at least narrow it down!)

Thank you Sir, Have a nice day.

Posted on Sep 20, 2009

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Posted on Jan 02, 2017

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1 Answer

Is Premium and higher octane better than regular gas in Mazda 3, 2012 car?


Octane ratings have nothing to do with fuel economy or power. The octane rating only indicates how much the fuel air mixture can be compressed before it ignites without the spark plug firing in a hot running engine. Some really high compression engines require higher octane fuels so they don't knock when running. If you don't have a sticker under the filler lid that says you have to use one of higher octane fuels, then don't use high-test.
It used to be that using a low octane fuel in an engine designed to use high octane fuels could damage the engine.
Nowadays, engines are all computer controlled and most high octane engines will re-tune themselves on the fly so that they don't knock if the wrong grade of fuel is used.

Feb 20, 2015 | Mazda MAZDA3 Cars & Trucks

Tip

Why to Use a fuel with the lowest required octane in the car?


Low-octane "regular" gas is usually all that is required. Octane is only a rating of the fuel's resistance to engine-damaging pre-ignition ("knock") in high-performance engines (that few people have). Low octane gas is less expensive and a better value if that's all your engine requires. Best case scenario you're wasting money by filling up with a higher than recommended grade of gas. Worst case scenario that high octane fuel is building up damaging carbon deposits in your engine because it's not being burned as completely as lower octane fuel would be. Check your owner's manual to be sure. Modern high performance cars will sometimes recommend higher octane fuels because they are engineered to use those fuels. The use of lower than recommended octane will not make your car explode, the ECM (Engine Control Module, aka:computer) will adjust the fuel injectors and spark timing to save the engine and compensate for you cheaping out at the pump. Those adjustments will consist of retarding the spark (reducing power and efficiency) as well as dumping lots of extra fuel into the cylinders to cool them, potentially costing you more than getting mid grade or premium IF that's what your car requires. NOTE: Remember that engines need less octane at higher altitudes. If your engine does not "knock" on regular, paying more for a higher octane rating is a waste since the increased octane makes no significant improvement to gas mileage and it is no better for your engine. All available fuels have detergent and additive packages. This will help.good luck.

on Mar 08, 2010 | Toyota Prius Cars & Trucks

1 Answer

Why does my 1998 vw beetle have engine knock uphill?


engine not time properly or very low octane gas
try octane booster first available at most parts store
if it cures the knock put a higher grade gas next fill up

May 25, 2011 | 1998 Volkswagen Beetle

1 Answer

Can you put 87 gas in it's 91 required gas tank? what are the risks/


NOPE OCTANE TOO LOW.YOU WILL GET A LOT OF ENGINE PINGING NOISE WHILE DAMAGING THE ENGINE, CADILLAC RUN ONLY ON 91 HIGHER OCTANE.

Apr 01, 2011 | 1995 Cadillac Eldorado

2 Answers

Was told to use premium 89 octane gas only this true?


This is true. The only time you need to apply gasoline with higher octane is when preignition is present. If it sounds like marbles are bouncing in your engine when you are driving then get higher octane. However if the car is in good mechanical condition (cooling system, oil serviced regularly) then 89 octane is perfect.

Jan 03, 2011 | 2001 Buick Century

1 Answer

Put gasoline instead of petrol in the tank


YOU NEED TO CAREFULLY REMOVE OR DRAIN OUT GASOLINE BECAUSE GASOLINE OCTANE LOW PETROLEUM GAS OCTANE HIGHER.GASOLINE WILL BURN BUT LOW OCTANE CAN HARM ENGINE.

Oct 17, 2010 | 1994 Toyota Corolla

1 Answer

Developing a ping... not bad gas, low miles


It may not be bad gas, but it could be the wrong octane rating for that engine. Check your owner's manual and see what octane is recommended for that engine. If you're running 87 octane and it requires 91 or higher octane, then you need to be running the higher octane fuel. By running lower octane fuel in an engine that requires higher octane, your getting pre-ignition, the knocking sound you hear. What's happening is that as the piston moves up on the compression stroke, the gas/air mixture is compressing and as the pressure goes up, so does the temperature of that mixture. It's possible that temperature can get so hot that the gas/air mixture ignites from the high temperature and not from the spark plug. Higher octane fuel will help this since higher octane fuel is harder to ignite. I say try running some 92 or higher octane fuel in your car and see if you still hear the knocking.

Jun 06, 2010 | 1986 Lincoln Town Car

2 Answers

I have a 05 nissan sentra and it rides great, but the gas mileage is terrible only getting approximately 18-20 mpg. What may be the problem. I upgraded the gas octane.


you need to change the spark plugs and wires to properly burn the gas fully then you can just get agood oil change and you would get better gas mileage

Oct 29, 2009 | 2005 Nissan Sentra

1 Answer

When u apply gas there is a knocking in the engine


Sounds like the timing is off. What octane of fuel are you using? If it low octane get an octane boost additive, and then change from the lower price low octane fuel to the higher octane fuel on your next fill up.

Aug 30, 2009 | 1992 Buick LeSabre

1 Answer

2003 stype jaguar chek engine light went after low octane gas was put in


thats because of spark knock which can damage the engine(pinging). if you have not hurt any thing, immediatly put in some octane booster and then premium fuel. also keep your foot out of it to keep the load off the engine to reduce pinging until the yucky gas is gone. the light should go out on its own when the correct octane fuel is in use. dont use anything lower than 91 octane in it or ull b sorry...

Aug 24, 2009 | Jaguar S-Type Cars & Trucks

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