Owners of other Toyota and Lexus vehicles such as the Camry, C-HR, Venza, Avalon, 86, Sienna, Tacoma, RAV4, Highlander, 4Runner, Sequoia, IS 350, RX 350, UX 200, GS 350, IS 300 and ES 350 may also find these DIY instructions to be helpful.

A few of the possible symptoms of a failing or faulty camshaft position sensor include rough idling, reduced fuel economy (lower MPG), stalling, slow acceleration, stumbling, reduced power, vibrations, rough starting, an erratic idle and possibly also a CEL / SES (check engine light, service engine soon) indicator warning light on the instrument gauge cluster.

If you have an OBDII scanner (also known as an OBD2 scan tool), you might discover a camshaft position sensor related DTC (diagnostic trouble code) such as P0340, P0341, P0342, P0343 and P0344.

The OEM (original equipment manufacturer) part number is Toyota 90919-05060 (also known as Toyota 90919-T5005).

A compatible replacement aftermarket camshaft position sensor with its part number is the Holstein 2CAM0057.

The tools needed to complete this procedure include a 10mm socket and a 1/4" drive ratchet.

The first two steps are to open the hood and then move to the right (driver) side of the engine.

It appears that the 2ZR-FAE 1.8L I4 engine is equipped with three (3) camshaft position sensors on the top of the valve cover in between the last spark plug on the right and close to the 12V automotive battery.

I recommend cleaning off the top of the engine with compressed air or a wet/dry shop vacuum to help reduce the risk of having debris fall down into the sensor port (opening).

It would also be best to only check or change one sensor at a time to further reduce the chance of having a foreign object fall into the valve cover.

Push in the release tab on the electrical connector before sliding it straight off the old sensor.

Tuck the electrical connector and the wire harness aside in a safe place.

Loosen the single silver metal bolt that secures the sensor in place by turning it in the counterclockwise direction.

Spin out the bolt the last few turns by hand to help prevent it from falling down and becoming lost in the engine bay.

Set the bolt aside in a safe place.

If you just yank out the old sensor and the rubber o-ring gasket breaks apart, the rubber pieces may fall down into the engine.

The original sensor in this 2020 Corolla LE was marked with the part number 3770 12B11 (or 3770-12B11).

The compatible replacement OEM sensor part number is Toyota 90919-05060 (or 9091905060) and also known as Toyota 90919-T5005 (or 90919T5005).

If you'd like to try cleaning the electrical contacts on the old sensor before buying a new sensor, I recommend only using a cleaning spray specifically made for electronics such as CRC Electronic Cleaner.

Lubricating the o-ring will help it form a better seal, prevent oil leaks and also make the sensor easier to remove in the future.

Lower the new sensor into the opening. Line up the bolt hole in the sensor with the corresponding hole in the valve cover.

Spin in the bolt a few turns with your fingers to help prevent it from becoming cross threaded.

Tighten the bolt in the clockwise direction with the 10mm socket and a 1/4" drive ratchet.

Try to avoid over tightening the bolt to prevent from cracking the plastic sensor housing.

You should feel or hear the power plug "click" securely into place.

If you have an OBDII scanner, check for any camshaft position sensor related DTC (diagnostic trouble codes), clear the codes, turn off the ignition and turn it back on to see if they re-appear.

To test the new sensor, start the engine and listen closely for any strange sounds. If you do hear any weird noises, immediately turn off the ignition and double check your work.

Be sure to write down the procedure in your car's service records.

Please check out all of my 2020 Toyota Corolla DIY Repair & Maintenance Guides.