Why does the engine light come on after an oil change?
4 Answers
It may be due to poor combustion conditions, as poor engine combustion is the main reason for the engine warning light to illuminate. Here is relevant information about engines: 1. Concept: An engine (Engine) is a machine capable of converting other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. For example, internal combustion engines typically convert chemical energy into mechanical energy. 2. Classification: Internal combustion engines, external combustion engines, meaning the fuel burns outside the engine, gas turbines, and jet engines.
I just had my oil changed and now the engine light is on. This has happened several times in my car, and each time it was due to an oil-related issue. There are a few main reasons: the mechanic may not have controlled the amount properly during the oil change—too much or too little oil can cause unstable oil pressure, triggering the sensor alarm. Or, the oil pressure sensor plug might have been accidentally loosened during the operation, leading to poor contact and sending wrong signals. Sometimes, using the wrong type of oil, such as oil with too low or too high viscosity, can also cause similar problems. It is recommended to stop the car immediately and first check the oil dipstick yourself to ensure the oil level is between the MAX and MIN marks. If it's normal, there might not be a big issue, but it's still not safe. It's best to go to a professional shop to read the fault codes with a computer for further diagnosis. Don't risk driving long distances to avoid engine damage. Remember, regular maintenance is good, but choosing qualified oil and correct operation are key preventive measures.
It's quite common for the engine light to come on after an oil change. Common causes include too much or too little oil causing pressure imbalance, or sensor connectors being loosened during maintenance. Excessive oil puts a heavy load on the pump, while insufficient oil leads to inadequate lubrication, both triggering system errors. Another possibility is residual old oil not being cleaned properly during the oil change, mixing with new oil and causing contamination. It's recommended to first verify the oil level using the dipstick – improper levels can often be fixed by adjustment. If levels are normal, don't delay; immediately use an OBD tool to scan for trouble codes to identify the cause. Safe driving is paramount – neglecting such minor issues may lead to engine damage. I suggest developing the habit of checking oil pressure after every service and using manufacturer-recommended oil to minimize risks.
After changing the oil, the engine light came on, and I was extremely nervous the first time it happened. A friend explained that it might be due to disturbing the sensor during the oil change or an error in the oil quantity, such as too much oil causing high pressure or too little causing low pressure, triggering a warning. It could also be that the wrong oil grade was used, not adapting to seasonal changes. A simple solution: park and check the oil dipstick level; if it's within the normal range, it's probably fine, and the light might turn off by itself. If it stays on, for safety, drive to a repair shop to scan the code and identify the fault. Don't be as careless as I was before; ignoring it could lead to increased fuel consumption or engine overheating. Choosing the right oil for daily maintenance is key.
