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Gary
Gary, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 955
Experience:  Senior Technician
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I have a 2006 Mitsubishi ES and I got a P0031 code (HO2S

Customer Question

I have a 2006 Mitsubishi ES and I got a P0031 code (HO2S Heater Control Circuit Low bank 1, sensor1
JA: Which particular sensor are you asking about? And have any trouble codes been triggered?
Customer: the engine light came on for maintenenceI changed the oil and filters and try to rest the light and I got P0031 and P0171 what do I need to do or replace
JA: What is the model of your '06 Mitsubishi?
Customer: ES
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: lancer ES
JA: Anything else you think the mechanic should know?
Customer: Yes if anything that I can do myself
Submitted: 11 months ago.
Category: Mitsubishi
Expert:  Gary replied 11 months ago.

Hi there,

For the P0031, I would replace the front O2 sensor, closest to the cylinder head in the exhaust manifold.

The P0171 is a lean code for Bank 1, and could be the result of a fouling O2 sensor from the heater circuit not operating.

Clear the codes after replacing the sensor.

Hopefully the code doesn't return.

Gary

Expert:  Gary replied 11 months ago.

Hi again,

I hope my advice has been of assistance to you.

Kind regards

Gary

Expert:  Gary replied 11 months ago.

Hi again,

Do you need any futher help?

Kind regards

Gary

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