Plymouth Laser Has A Check Engine Light

Troubleshooting the Check Engine Light in Your Plymouth Laser: Common Causes and Solutions

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Emissions System
0%
60% chance it's
Something else
The most common reasons a Plymouth Laser has a check engine light are an emissions system component, a sensor, or a catalytic converter.
  • Emissions System: A faulty emissions system component, such as an oxygen sensor or EGR valve, can lead to increased emissions and trigger the check engine light.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a Plymouth Laser has a check engine light?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

A faulty oxygen sensor is one of the most common causes of a check engine light. Symptoms may include a decrease in fuel mileage, hesitation or misfiring from the engine, rough idling or even stalling. A faulty sensor may cause the vehicle to fail an emissions test.

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

Due to the nature of electrical systems on modern vehicles, the range of problems these can cause are nearly limitless. However, there is a way to categorize them in two ways. Permanent and intermittent problems. Permanent problems appear and remain. This may be the vehicle will not start, the radio does not work, or the door chime will not turn off among many, many others. These problems are more straight-forward to diagnose since they present themselves at all time. This means there will always be a fault to find. Intermittent electrical problems, however, can be difficult or impossible to locate, since they appear then disappear without warning. The best case scenario for an intermittent issue is when replicating the problem is easily accomplished and understood. This allows a technician to make an issue semi-permanent, allowing them to find the fault. Other issues that come and go without warning and cannot be replicated on demand must occur when the technician is servicing the vehicle, otherwise there is no problem to correct. It is most important to understand that electrical system faults always require inspection, and can include the vehicle working in any manner, or not working at all.

Like we noted in the last section, general diagnosis symptoms are the most vague of the bunch. There are several diagnostic spectrums, electrical diagnosis, drivability diagnostics, engine diagnostics, transmission diagnostics, and the list could continue for about 5 or 10 more spectrums of diagnostics. The most important take-away here, is that general diagnostics are diagnostics that have no other spectrum in which they fit, or the problem is unknown. This means that any vehicle left outside of a repair facility with the keys and an authorization to perform diagnosis will be diagnosed under the general diagnosis spectrum.

When the Check Engine Light comes on, you may experience engine performance issues such as poor acceleration, rough idling, or an engine that won't start. In some cases, no abnormal symptoms will be experienced. Other systems like the transmission or ABS can cause the Check Engine Light to illuminate and lights for those systems can come on at the same time. Similar lights may say "Check Engine Soon", "Malfunction Indicator Light" or just "Check". In rare case the engine can overheat.

Troubleshooting Check Engine Light in a Plymouth Laser

When faced with a Check Engine Light in your Plymouth Laser, it's essential to adopt a systematic diagnostic approach that begins with the simplest solutions before delving into more complex issues. Start by checking for any obvious problems, such as loose gas caps or visible leaks, which are common triggers for the light. Next, utilize the key cycling method to retrieve any trouble codes, as these codes will provide specific insights into the underlying issues. Understanding these codes is crucial, as they can point directly to malfunctioning components like the oxygen sensor or catalytic converter. If the light remains illuminated after addressing simple fixes, inspect the vehicle's fuses, particularly those related to the engine management system, as a blown fuse can prevent the light from functioning correctly. By methodically working through these steps, you can effectively identify and resolve the issues causing the Check Engine Light to illuminate, ensuring your Plymouth Laser runs smoothly and efficiently.

What to Check When the Check Engine Light is On in a Plymouth Laser?

When the check engine light illuminates in your Plymouth Laser, it serves as a crucial alert that something may be amiss under the hood. One of the first things to check is the gas cap; a loose or damaged cap can trigger the light due to fuel vapor leaks. Next, inspect the spark plugs and their wires, as worn or faulty components can lead to misfires and poor engine performance. It's also wise to verify the oil level and pressure, as low oil can cause significant engine damage. The oxygen sensor and mass airflow sensor are critical for optimal engine function, so ensure they are clean and operational. Additionally, examine the catalytic converter for blockages or damage, which can affect exhaust flow and emissions. Overheating can also trigger the check engine light, so monitor your engine temperature closely. Lastly, don’t overlook the battery and transmission; issues in these areas can also lead to warning lights. For a more precise diagnosis, consider using an OBD-II scanner to retrieve error codes, which can guide you in identifying the specific problem. Addressing these common issues promptly not only helps maintain your vehicle's performance but also prevents more severe damage down the line.

Why is the Check Engine Light Important in a Plymouth Laser?

The Check Engine Light in a Plymouth Laser is not just a mere inconvenience; it serves as a vital warning system that should never be ignored. When this light illuminates, it can indicate a range of issues, from minor concerns like a loose gas cap to more severe problems such as a malfunctioning catalytic converter or faulty oxygen sensors. Ignoring these warnings can lead to significant consequences, including decreased fuel efficiency, engine misfires, and even complete engine failure. Moreover, some issues may pose safety risks, such as irregular engine performance that could affect your ability to control the vehicle. By addressing the symptoms indicated by the Check Engine Light promptly, you not only safeguard your vehicle's performance and longevity but also prevent potentially costly repairs down the line. Therefore, staying vigilant and proactive about the Check Engine Light is essential for any DIY enthusiast looking to maintain their Plymouth Laser in optimal condition.

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