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If i have a blown head gasket would my check engine light come on?

If i have a blown head gasket would my check engine light come on? Topic: Hot case set on case
June 19, 2019 / By Jess
Question: my car overheats, i had the radiator replaced and it still does. im going to have thermostat checked tomorrow. if its a gasket then my car is done (95 honda accord). Just wondering if it was gasket would the check engine light come on.
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Best Answers: If i have a blown head gasket would my check engine light come on?

Glendower Glendower | 4 days ago
you dont always get a check engine light on when a head gasket blows, if you're loosing coolant that would be a good indication. And just cause your head gasket is blown doesnt mean you'd be loosing oil either, head gaskets can blow inbetween cylinders and just burn coolant very slowly but not loose compression or oil. The only trouble code that would even be associated with a blown head gasket would be a p0300 misfire code, but thats only in extreme cases and before that code would be set you would already notice bucking and missing and see white smoke out of the tail pipe. My girlfriend's 96 accord had a blown head gasket, no CEL on, it only missed when you let it sit overnight and complete a heat cycle (hot to cold) and it would miss and idle and then go away after about 10 seconds. Best thing to do is either have your car pressure tested and pull all the spark plugs and shine a flash light down there and see if there is any coolant in the cylinders. Or you could let it sit overnight from hot to cold and then pull the plugs in the morning and check for coolant. Hope this helps -Chris (Lead Tech - Hamilton's Car Care)
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Glendower Originally Answered: If i have a blown head gasket would my check engine light come on?
you dont always get a check engine light on when a head gasket blows, if you're loosing coolant that would be a good indication. And just cause your head gasket is blown doesnt mean you'd be loosing oil either, head gaskets can blow inbetween cylinders and just burn coolant very slowly but not loose compression or oil. The only trouble code that would even be associated with a blown head gasket would be a p0300 misfire code, but thats only in extreme cases and before that code would be set you would already notice bucking and missing and see white smoke out of the tail pipe. My girlfriend's 96 accord had a blown head gasket, no CEL on, it only missed when you let it sit overnight and complete a heat cycle (hot to cold) and it would miss and idle and then go away after about 10 seconds. Best thing to do is either have your car pressure tested and pull all the spark plugs and shine a flash light down there and see if there is any coolant in the cylinders. Or you could let it sit overnight from hot to cold and then pull the plugs in the morning and check for coolant. Hope this helps -Chris (Lead Tech - Hamilton's Car Care)

Dougie Dougie
This Site Might Help You. RE: if i have a blown head gasket would my check engine light come on? my car overheats, i had the radiator replaced and it still does. im going to have thermostat checked tomorrow. if its a gasket then my car is done (95 honda accord). Just wondering if it was gasket would the check engine light come on.
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Brent Brent
To answer your question maybe! There are some good answers to this question but even if it had a misfire there is a fine line as to if it has a misfire monitor because it is a 1995 and OBDII was not mandated until 1996 so you don't know without looking at the vehicle if it actually has OBDI or OBDII system! But there is one other thing that could make the the MIL or CEL whatever the case is light come on that was not touched on is a fouled O2 sensor from coolant in the exhaust and that could make the CEL lamp come on with a O2 code! But the other thing is that sometimes that pressure testing the cooling system to check for a blown head gasket is inconclusive, the best way to check it is what we call a block test that is when the radiator is checked for the presence of hydrocarbons in the cooling system this is the most accurate way to check! Hope this helps :)
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Ahern Ahern
For my 2000 Prelude, my mechanic just concluded today that the head gasket is blown. A month ago, it wouldn't start. AAA came and got it started after MANY attempts. It ran for 2 weeks with no issues, no hot gauge, etc. Then, no start on a Sunday. Then Monday am it started. I have rented a car for 2 weeks waiting for the mechanic to have time to diagnose. The check engine light never came on. So, no, it won't necessarily come on.
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Sunday Sunday
it could come on or it might not. if its slightly blown then it may not trip a code as the engine might not be running rough enough to cause erronious readings in any sensors. if horribly blown it could mess with things like o2 sensor readings and such and toss a code. there are NO codes that say "you have a blown head gasket" though so if that's what you are asking then you can forget it lol. a head gasket on a 95 accord is easy to replace as long as you have a standard set of sockets and a torque wrench. do you have white smoke out of the exhaust fogging up the area?? if the car is off and cold and you pull off the radiator cap and then crank the engine, does coolant shoot out everywhere?? both of these are classic symptoms of a blown head gasket. the waterpump itself could also be going out as well...
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Sunday Originally Answered: How to rest the engine mat. light on the dash of a 2009 Toyota Corolla after oil change?
At 4500 miles since last reset, the Maint Reqd light will blink at you on startup (very easy to miss seeing it). At 5000 miles since last reset, the Maint Reqd light will stay on solid. It's just a reminder by miles that you are due for the next scheduled maintenance. It is not smart (doesn't go by time, or do any oil analysis), just a mile counter. Usually that is an oil change/tire rotation: http://smg.toyotapartsandservice.com/ Should your dealer forget to reset it, or you go to an independent mechanic or DIY, you can reset the light yourself. The odo-button dance procedure to reset the light is listed in Page 122-123 of the US 2004 Prius Owner's Manual (Section 2-5 "Operation of Instruments and Controls: Gauges, Meters and Service Reminder Indicators", item (j) in the "Service reminder indicators and warning buzzers" section). It should be listed in a similar section in your 2009 Corolla's Owner's Manual.

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