Check Engine Light

Reset with an OBD2 scan tool, after the repair of whatever triggered the light.

The " check engine light" is by far one of the most misunderstood technological advances by the public. I am sure I will revise this as time goes on, as it is an in-depth understanding for the public. It is a warning light that is illuminated when there is a problem with the EMISSION SYSTEM only. Emission system being the pollution control system. Don't get a hard on against it as it is a good thing once you understand it. One point that was brought up a a recent meeting of technicians was that the amount of hydrocarbons is greater when the gas cap is left off than when the engine is running. Hydrocarbons are part of pollution emitted as gasoline evaporates. Going a step farther, one facet of the emission system is the "Evaporative" portion. This is when the fumes from the gasoline are leaking from the system into the outside air. This is one part of the emission system that can trigger a check engine light. I would say that about 7% of the vehicles that have a check engine light are the result of a loose or inadequate gas cap. But understand that many scenarios are possible with the "check engine light" The vehicle's powertrain computer (note that some vehicles have 17 different computers) will run a series of self-tests. They will only run under certain criteria. And they can be vastly different from manufacturer to manufacturer. Some self-tests are not run until preceding ones have run successfully. So if there is a problem in one particular area that is preventing another self test from running, you can have a situation where one problem is fixed, but another still exists. If you fix a problem and drive the car through a drive cycle that sets the monitor (or self test) the light will go off as it passes that criteria that triggered it in the first place. After 1996, the auto industry went to a idea called OBD II (on board diagnostics). This was to get all the manufacturers onto a similar plane for troubleshooting and powertrain control. While they still differ vastly, many corrections and adaptations were made for technicians to better fix the check engine light problems. Prior to this there were so many different and poor troubleshooting data from a check engine light problem that resolving the problem was much more difficult. Many early warning light of this nature were set to illuminate based on mileage. An Oxygen sensor was one of the things that were meant to be replaced when that mileage was hit. This is much like many current "Change oil lights

Disconnect positive battery terminal for approximately 10 minutes. If there is really no problem, light will not stay lit after start up. You will lose clock settings. I did this when mine came on and reported DTC 55 which is just an "end of list" indicator.

Check Engine and Reduced Power

P0401, P1125, P1295, P1515

I had this problem. It drove me crazy for a while. My father previously owned the car and a professional mechanic serviced the car several times. He replaced the accelerator position sensor and whatever else he did I don't know. I don't blame the guy for not being able to fix it, as they only have so much time to figure car troubles out because they have other people to service. However, I am just someone who began to read a significant amount of information on the automobile: the engine, the brakes, the suspension, the sensors, ...the overall functioning. I did two gasket overhauls, with changing various parts to update the functioning (timing belt, plugs, several sensors, cooling system parts, charging system, pulleys, dented oil pan, oil pump, seals, valves on one of the cars, ...whatever I thought "hey, after 200,000 miles, it probably makes sense", I think it does; mind you, I did do specification checks on what needed checking with the cylinder heads). I still drive one of them (3000GT, may as well be a car you like), and a 2000 Eclipse (bought it brand new, and constantly kept up on the oil), which is now deceased (I won't go into the details), but I still pulled the engine (which still ran awesome, when I checked to see if it still ran <thank God, that would have been a total waste> and to replace this car....ta da >>> my old man gave me the 2000 Trooper. (I apologize for the long story, just want you to get an idea of what where I'm coming from)

With 168,000 miles, and no timing belt change, sparks pugs, literally nothing... I went ahead and did all that plus some other stuff merely because I was deep enough into the area, or had access, rather. When I pulled off the "common chamber" which is the intake manifold I began to clean it and was surprised by a large blot of built up crap in the port for the "MAP SENSOR!!!". It ruined the sensor itself which I did not rule out right away because I just wanted to see what would happen. I left the old one in but purchased another one just in case. Low and behold a few days went by, there were no mil or reduced power for those few days but bam they did come back on. I REPLACED THE OLD MAP WITH THE NEW AND NOW IT RUNS BEAUTIFULLY, NO PROBLEMOS. It's been a couple of months now, I can take it anywhere and not worry about the limp home mode preventing me from controlling the throttle and making me feel like the only idiot being able to reach that 10 MPH limit on the way back home.

I did purchase an ISUZU electronic copy of the manual (from HELM INC.) and it mentions so faintly about the correlation between the MAP reading and the throttle position. They mostly point to the TPS or Accelerator sensor predicament, so who'd of thought (I can only imagine that you can only publish a limited number of scenarios, not every possible one). The MAP reading also affects the EGR reading which was the initial check engine light cause. This was definitely what fixed mine.

ON A FINAL THOUGHT:

The automotive engine and the whole car itself is really really really a crazy marvel of invention. And though this world doesn't push people to realize this in its most direct way. after all, who has time right? people should make time to try and follow how it works and what keeps it working. It would save a lot of misery and aggravation.

The service engine or check engine light can be reset with a scan tool or by unhooking the battery. The light will return if the failure that caused the code is not repaired.

I am sorry but you don't and you will need one to clear codes after the repair.

The vehicle's computer has detected a malfunction that is either performance or emmissions related and has sent a sgnal to the check engine light to illuminate. To retrieve the trouble code(s), the OBDII has to be scanned. If you don't have a scanner, there are auto supply stores that will scan as a free service.

PO341 Camshaft Position Sensor Circuit Range Problem

The PCM stores P0700 when it detects a code stored in the tcm. You need to check the transmission computer with a scan tool to know possible causes.

When the neutral light is flashing on a Mitsubishi Endeavor, it typically indicates an issue with the transmission system. This could be caused by a malfunction in the transmission control module or other related components. It's advisable to check the owner's manual for specific troubleshooting steps and to consider having the vehicle inspected by a qualified mechanic to diagnose and resolve the problem. Ignoring this warning may lead to further transmission issues.

The "Service Vehicle Soon" light on a 2004 GTO can be triggered by various issues, such as a malfunction with the vehicle's engine, transmission, or other critical systems. It often indicates that the onboard diagnostic system has detected a fault that requires attention. Common causes include problems with sensors, electrical systems, or fluid levels. It's advisable to check for error codes using a diagnostic scanner to pinpoint the exact issue.

The "Engine Service Soon" light on a 2000 Pontiac Bonneville indicates that the vehicle's onboard diagnostics system has detected a potential issue that requires attention. Common causes can include problems with the engine, transmission, or emissions system. It's advisable to retrieve any trouble codes using an OBD-II scanner to pinpoint the issue, and then address it promptly to avoid further damage. Regular maintenance and inspections can help prevent such warnings from occurring.

To reset the check engine light on a 1996 Nissan pickup, you can disconnect the negative battery terminal for about 15 minutes. This will clear the onboard computer's memory, including the check engine light. After reconnecting the battery, start the vehicle to see if the light remains off. If the light comes back on, it may indicate that there is still an underlying issue that needs to be addressed.

To reset the check engine light on a 2008 Chrysler Town and Country, you can use an OBD-II scanner to clear the trouble codes. Simply plug the scanner into the vehicle's diagnostic port, turn on the ignition, and follow the scanner's instructions to erase the codes. Alternatively, you can disconnect the vehicle's battery for about 15 minutes, then reconnect it, which may also reset the light. However, ensure that any underlying issues are addressed to prevent the light from reappearing.

In Maryland, a check engine light indicates a potential issue with the vehicle's emissions system, which can lead to a failed state inspection. During the inspection, if the light is illuminated, the vehicle will automatically fail, regardless of the other components' conditions. It's crucial to address any underlying issues before attempting the inspection to ensure compliance with state regulations. Repairing the issue and clearing the check engine light is necessary for a successful inspection.

Flashing solar lights typically indicate a low battery charge or a malfunction in the light's circuitry. When it gets dark, the solar light should activate; if the battery is insufficiently charged, it may blink as a warning. Additionally, a poor connection or defective components can also lead to this behavior. It's best to check the battery and connections or replace the light if the issue persists.

Yes, a faulty idle control valve can trigger the service engine light. When the idle control valve malfunctions, it can lead to erratic engine idling or stalling, causing the engine control unit (ECU) to detect an issue. This triggers the check engine light as a warning to the driver that there's a problem that needs attention. It's advisable to have the vehicle diagnosed to identify the exact cause of the warning light.

To reset the check engine light on a 2004 Toyota 4Runner, you can disconnect the negative battery terminal for about 15 minutes. This will clear the vehicle's computer memory, including the check engine light. Alternatively, you can use an OBD-II scanner to erase the trouble codes directly. However, ensure that any underlying issues are addressed before resetting the light, as it may come back on if the problem persists.

The check engine light on a Hyundai Santa Fe can indicate a variety of issues, ranging from minor problems like a loose gas cap to more serious engine malfunctions. It's important to diagnose the specific cause by using an OBD-II scanner to read the trouble codes. Ignoring the light could lead to more significant damage or costly repairs, so it's advisable to address the issue promptly. If you're unsure, consulting a certified mechanic is recommended for a thorough inspection.

To reset the low tire pressure light on a 2008 Dodge Caliber, first ensure that all tires are properly inflated to the recommended pressure. Next, turn the ignition key to the "On" position without starting the engine. Press and hold the tire pressure reset button, typically located beneath the steering wheel or on the dashboard, until the light blinks and turns off. Finally, start the engine, and the light should remain off if the tire pressures are correct.

If the service light is in the shape if a spanner then I presume it is like the 2008 model. In which case press and hold the trip button "0.0" before inserting the key. Insert ignition key while holding down the trip button and turn on ignition without starting car. Release the trip button and the service light spanner will cease to flash. Now turn the trip button to the right (clockwise) and it will reset. Service light (spanner) should disappear and only return when the next service is due!

The "Check Engine Soon" light typically indicates that the vehicle's onboard diagnostics system has detected an issue that needs attention. At around 60,000 miles, this could signify routine maintenance necessities, such as replacing spark plugs or oxygen sensors, or it could point to more serious problems like an engine misfire or issues with the emissions system. It's advisable to have the vehicle scanned for diagnostic trouble codes to identify the specific issue and determine the necessary repairs. Ignoring the light could lead to more significant damage or costly repairs down the line.

If your Ford Focus displays an "engine system fault" warning, it typically indicates a problem with the engine or its components, which can range from minor issues like a loose gas cap to more serious concerns such as sensor failures or engine misfires. It's crucial to address this warning promptly, as ignoring it can lead to further engine damage. Consider checking the vehicle’s onboard diagnostics (OBD-II) for error codes and consulting a mechanic to diagnose and resolve the issue effectively.

The check engine light on a 1997 Daewoo Lanos can stay on due to various issues, including a malfunctioning oxygen sensor, a faulty mass airflow sensor, or problems with the vehicle's emissions system. It may also indicate issues like a loose or damaged gas cap, engine misfires, or problems with the ignition system. To diagnose the exact cause, it's advisable to use an OBD-II scanner to read the trouble codes stored in the vehicle's computer. Regular maintenance and timely repairs can help prevent the light from staying on.

To reset the check engine light on a 2008 Dodge, you can use an OBD-II scanner to diagnose and clear any trouble codes. Simply plug the scanner into the OBD-II port, turn on the ignition, and follow the scanner's instructions to clear the codes. Alternatively, you can disconnect the car battery for about 15 minutes to reset the system, but this may also erase other settings. Always ensure that the underlying issue triggering the check engine light is resolved before resetting it.