Peak PerformanceMobile Mechanics

Corolla engine light: oxygen sensor not reading correctly

Toyota Corolla hatch. Diagnosed and repaired on site in Perth.

Blue Toyota Corolla hatch parked in a driveway

The file

Reported
Engine warning light on.
Tested
Diagnostic testing at the vehicle.
Found
The oxygen (O2) sensor was not reading correctly, which was triggering the warning light.
Done
  • Replacement sensor sourced
  • Return visit booked to fit it as soon as possible
Result
Diagnosed on the spot, with the right part organised to keep downtime short.

What happened

The customer called about an engine warning light on their Corolla. We went to the car and ran diagnostic testing to find out what was behind it.

The oxygen sensor was not reading correctly, and that was setting off the light. Instead of clearing the code and sending the customer on their way, we sourced the replacement part and arranged to come back and fit it.

That is how we work. Find the cause, get the right part organised, and keep the time your car is off the road as short as possible.

O2 sensorExhaust flow
The oxygen sensor sits in the exhaust stream. On this Corolla it was not reading correctly, and that was what set the engine light off.
As reported O2 sensor reading: slow and flat
After the fix O2 sensor reading: switching as it should

Something similar going on with yours?

Send the vehicle details and what it is doing. We come to you, find the cause and keep you informed.