Why is my engine light on in my 2020 Nissan Altima?

If your 2020 Nissan Altima's check engine light comes on, there are a handful of usual suspects. More often than not, it's tied to the emissions system—think a wonky oxygen sensor, a loose gas cap, or maybe even issues with the catalytic converter. A quick fix might be as simple as snugging up the gas cap, or hooking up an OBD-II scanner to pull the trouble codes and pinpoint the problem fast. Malaysia's hot and humid weather can be tough on cars too; it tends to speed up electrical corrosion and sensor wear. So, it’s a good idea to periodically check those wiring harness connections to keep things in shape. Now, if the check engine light starts flashing and you feel the car losing power, that’s a red flag—could be a faulty ignition coil or spark plugs causing a misfire. You’ll want to get that fixed ASAP to avoid damaging the catalytic converter. Here’s something to remember: modern car ECUs store historical fault codes. Even if the light goes off on its own, it’s still smart to get a professional diagnosis. For models with the VC-Turbo variable compression engine, pay extra attention to your oil—both quality and level. Using low-viscosity oil that’s insufficient can trigger the engine’s protective systems, which you don’t want. In Malaysia, your best bet is to head to an authorized Nissan service center. They’ve got the OEM CONSULT diagnostic system, which can read those model-specific codes accurately and prevent misdiagnoses. And while we’re on maintenance, keep an eye on fuel quality too. Slumming it with low-octane gasoline long-term might just make that knock sensor throw a false alarm.