Check Engine Light Came On After Rain – Could It Be a Sensor Issue?
Quote from LadyGreaseHands on June 9, 2025, 2:20 pmI drive a 2015 Honda Civic. Yesterday, after a heavy rain, my check engine light came on the next time I started the car. The car seems to run fine — no noise or performance issue — but I'm worried if water might’ve caused a sensor to malfunction.
I used my OBD2 scanner and it gave a P0135 code (Oxygen Sensor Heater Circuit Bank 1 Sensor 1).
Has anyone faced this issue after rain or humidity?
Is it okay to drive for a few days with this code?
Could this be a moisture-related short or a failing sensor?
Thanks in advance!
I drive a 2015 Honda Civic. Yesterday, after a heavy rain, my check engine light came on the next time I started the car. The car seems to run fine — no noise or performance issue — but I'm worried if water might’ve caused a sensor to malfunction.
I used my OBD2 scanner and it gave a P0135 code (Oxygen Sensor Heater Circuit Bank 1 Sensor 1).
Has anyone faced this issue after rain or humidity?
-
Is it okay to drive for a few days with this code?
-
Could this be a moisture-related short or a failing sensor?
Thanks in advance!
Quote from ScanToolGuru on June 9, 2025, 2:31 pmYes, I've seen this issue before — especially on older cars or after heavy rain when the O2 sensor connector isn't fully sealed. Water gets into the plug and causes false signals.
I’d suggest unplugging the sensor and checking for corrosion or moisture. Blow it out with compressed air and reseat it.
Yes, I've seen this issue before — especially on older cars or after heavy rain when the O2 sensor connector isn't fully sealed. Water gets into the plug and causes false signals.
I’d suggest unplugging the sensor and checking for corrosion or moisture. Blow it out with compressed air and reseat it.
Quote from Kevin Nicholas on June 10, 2025, 7:47 amDriving short distances is usually safe with P0135, but long term it can affect fuel economy and emissions. If it's rainy season where you live, you might want to apply dielectric grease to connectors to prevent moisture-related shorts.
Driving short distances is usually safe with P0135, but long term it can affect fuel economy and emissions. If it's rainy season where you live, you might want to apply dielectric grease to connectors to prevent moisture-related shorts.
Quote from DIYDan on June 10, 2025, 7:55 amI cleared the code once and it didn’t come back. In my case, it was just temporary moisture. If it returns after clearing, then it’s likely a failing sensor.
I cleared the code once and it didn’t come back. In my case, it was just temporary moisture. If it returns after clearing, then it’s likely a failing sensor.
Quote from CarGuyBrad on June 16, 2025, 8:46 amI had a P0135 on my Toyota Camry. Replacing the O2 sensor heater fuse fixed it. Check your fuses before buying a new sensor — sometimes it’s just that simple.
I had a P0135 on my Toyota Camry. Replacing the O2 sensor heater fuse fixed it. Check your fuses before buying a new sensor — sometimes it’s just that simple.