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FIX IT MAN, Master Technician
Category: Mazda
Satisfied Customers: 17472
Experience:  Automotive Technician Trainer
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I have a 2008 Mazda 3 GS. Lately, poor acceleration in any

Customer Question

I have a 2008 Mazda 3 GS.
Lately, poor acceleration in any manual gear. Also gas consumption lousy.
At first I thought maybe the clutch but check engine light came on with a P2251 oxygen sensor reference ground circuit open - bank 1
Submitted: 1 year ago.
Category: Mazda
Expert:  FIX IT MAN replied 1 year ago.

Hello, my name is Bobby. Thank you for the question. Can you tell me if the oxygen sensor has been replaced How many miles are on the car?

Customer: replied 1 year ago.
Hi BobbyOxygen sensor has never been replaced.
Car mileage is at 299,854 km
Expert:  FIX IT MAN replied 1 year ago.

Does the engine seem to rev high and not have power or is the engine having trouble revving?

Customer: replied 1 year ago.
Seems sluggish at times to start and then in any gear, when I give it gas it revs high but doesn't accelerate right away then lunges faster.
Customer: replied 1 year ago.
Plus gas mileage has been lousy lately.
Expert:  FIX IT MAN replied 1 year ago.

Thank you. From the symptoms and the code you are getting I would suspect that the O2 sensor needs to be replaced. When this occurs the computer will stop using the O2 sensor input and run like it is open loop. Does your scan tool read live engine data to see what the O2 sensor reading is?

Customer: replied 1 year ago.
I can have a look in the morning. I have iPhone Dash Command app and the dash command tool which has diagnostics etc
Customer: replied 1 year ago.
Do you know where it would be located on the tool? I see dashboard with km/hr, hp, torque and accel.
Expert:  FIX IT MAN replied 1 year ago.

I don't believe that this app has it. You need to see if it says something like live data.

Customer: replied 1 year ago.
Ok...ill send you results in the morning.
Expert:  FIX IT MAN replied 1 year ago.

Sounds good. I will look for your response then.

Customer: replied 1 year ago.
There's a gauge/graph for O2 sensor voltages
Expert:  FIX IT MAN replied 1 year ago.

That should work. Once the engine is warm I need to know what the voltage reading does and how high and low the voltage gets and how quickly is changes. That will help.