P0172 Chevrolet - optra

Question

how do i fix po172 in chevrolet optra year 2009.

Answer 1

P0172 =Too rich combustion detected at the upper O2 sensor-It caused by

1- Bad or dirty Map sensor.

2- Bad Fuel pressure regulator.

3- Air leak to inlet vacuum system.

4- Bad O2 sensor itself.

Clean the map sensor-Check for any crack on hoses -masure the fuel pressure it should staebel under multi engine conditions-at the end read the voltage from the o\p of O2 sensor-it should around 0.5V-no more 1 volt or reach zero.

Good Luck