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Check Engine Light
The check engine light comes on in a car when the engine is experiencing a problem. Ask questions here about your car's check engine light.
7,238 Questions
Why hazzard lights keep blinking when engine is off?
Hazard lights are usually controlled by a manual switch [Push-ON, Push a 2nd time-OFF]. This is true whether the key, or engine, is on or off. The situation you describe suggests that you have inadvertantly engaged the hazard flasher switch [usually located on the steering column just below the steering wheel].
Why would the check engine light come on with a 2004 GMC envoy?
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
An error code P1684 from an OBDII code reader indicates that the battery had recently been disconnected. This is normal if a new battery was installed but can indicate a connection issue or grounding problem.
Your most likely culprits are going to be a loose, damaged gas cap, vent or purge solenoid, evap canister, or fuel pressure sensor. Other than the gas cap, I believe all of these items are dealer only.
Evaporative Emission Control System Malfunction
A code P0440 could mean one or more of the following has happened:
- The gas cap is not installed or working properly
- The purge solenoid has failed
- The canister is plugged and not working properly
P0440 EVAP System No Flow During Purge Possible Causes Setting Conditions
- Charcoal canister is loaded with fuel or moisture
- Fuel filler cap is loose, cross-threaded, damaged or wrong part
- Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
- Fuel tank pressure sensor is damaged, disconnected or it failed
- Fuel tank vapor line(s) is clogged, damaged or disconnected
- Purge valve vapor line is clogged, damaged, or disconnected
- Purge or vent solenoid power circuit is open (check the fuse)
- PCM has failed
DTC�P0107, P0108, P0112, P0113, P0115, P0116-P0118, P0121, P0122, P0123, P0125, P0443, P0449, P0452, P0453, P1106, P1107, P1112, P1114, P1115, P1121 and P1122 not set, engine started, ECT and IAT sensors from 39-86�F and within 16�F at startup, vehicle driven at a steady speed less than 72 mph, system voltage over 10.0v, BARO sensor more than 75�kPa, fuel level from 15-85%, and the PCM detected the EVAP system was unable to achieve and maintain vacuum during the EVAP flow and leak test. Note: An Ultrasonic Leak Detector can be used to help detect a leak.
This code sets in 2 Trip(s).
What does the check engine light mean on an Acura Integra?
There is a problem that is emission related. Take it to an independent garage that is skillful in troubleshooting. If you wait too long you can create more problems not to mention may start losing fuel economy. Also, some cars will automatically turn check engine light on after certain mileage (typically 60k and 120k). The Maintainence Required light came on in my 1998 Acura Integra GS and a mechanic told me to try holding the trip mileage reset button in and then turning key into on position. I have not tried this yet. However, you should do general maintainence after recommended mileage or time (belts, spark plugs, fluids, etc.), but that does not always require a mechanic. It could be a bad Oxygen (O2) sensor, particularly if it is associated with your car running too rich and a drop in your fuel mileage. You can actually find out the fault by jumping out a service check connector. If you pick up a haynes manual (most auto parts stores have them)it will tell you how to do it in chapter 6.
How do you reset the engine service light on a 98 Ford Escort?
Unplug the battery for 15 mins will reset the check engine light, but watch will reset all your sensors to. Personal experience it will not read for at least 100 miles, so dont do it when you need an inspection
Coolant recover tank low or the sending unit on the tank is defective.
You need to keep tabs on your oil every time you gas up, if it was in fact, 'low on the stick'. If it was not low, I would disconnect the ground cable on the battery to reboot your computer and clear codes. If it comes on again, it will be one of two things: the oil sender is bad(most likely and most common) or your oil pressure is low.If the engine runs quietly, it is probably the sender.Have it replaced.
What might cause a 2001 Chevy Impala 3.8L check engine light to stay on?
Several things could cause the 2001 Impalas check engine light to stay on. Since so many things could be wrong, check the computer codes for any leads on possible problems.
take it to a dealer or a qualified mechanic for a diagnostic
You replaced oxygen sensor on 1991 Chevrolet Cavalier and check engine still stays on why?
You can take your vehicle to any Autozone and they will hook it up to the computer and tell you what your ECM has for an error code. IF the ECM or PCM on the vehicle has the problem replaced. The ECM or PCM needs to be reset. Once reset and if the light comes back on, you did not replace the correct part.
Im not sure what sort of diagnostic port this vehicle would have, if any. Todays OBD (on board diagnostics) are all designed to be accesible to the driver whilst in the drivers seat, although yours probably wasnt built with this standard practice in effect.Some vehicles diagnostic port tends to be near to the fuse/relay box.
How do you reset the check engine codes on a 1994 Plymouth Voyager?
if you disconnect the battery for at least 5 minutes then reconnect it ,it will reset the check engine light
Reset the fuse, and if the light still comes on take it to autozone they will run a free diagnostics check
Was the car actually running hot? Is there water in the oil? You could have a weak head gasket that starts to lek under driving conditions. Get it in the shop before you crack a head. If the car is running hot, does it over heat while driving or will it overheat at a stop? If it does it will driving, check your trans fluid. About half of nuisance overheating can be traced back to the trans fluid cooler in the radiator.
How do you reset the service engine soon light on a 1998 S-10 Blazer?
The service engine soon light is on because the ECM (Engine Control Module) has detected something wrong with the system. Until the problem is fixed the light will remain on. Any attempt to reset the light without making repairs will result only in the light coming back on again. Have a trusted mechanic diagnose the problem for you soon. Waiting may cost you more in the long run.
How do you fix p0420 code in rav4 2003?
Replace the catalytic converter
Replace the catalytic converter
How do you reset the check engine light on a 2006 Chevy Cobalt?
First you must fix the problem that caused the light to be set. You can try to reset the light by disconnecting the negative battery cable for five minutes. If that does not work you will need an 0BD2 scanner in order to reset the light.
What is the check engine light code 35 mean for a 1995 Chevy 1500?
35- idle air control (iac) valve/ circuit
Service engine soon light blinking vehicle miss while driving?
If the check engine light is blinking that indicates that the catalytic converter will possibly be damaged if you ignore the problem and continue driving the vehicle.
i had a car in the shop here last week with that problem and it turned out to be a cracked vacumn hose. I lifted the hood and could hear the hissing sound from the vacumn leak . The crack was in the 90 degree bent hose connected to the PCV valve.
This was a GM vehicle with the 3400 engine.
How do you reset check engine light for the 2009 Chevy trail blazer?
How do you reset check engine light for the 2009 Chevy trail blazer?
