O2 Sensor
Thread Starter
Senior Member
Posts like a 4 Banger
Joined: Jun 2005
Posts: 110
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From: Upton, Massachusetts
O2 Sensor
What exactly does it do?
Why does it affect gas mileage?
Can you tell if the engines running lean by looking at an old one?
Should i reset the PCM after installing the new one?
Thx in advance
Why does it affect gas mileage?
Can you tell if the engines running lean by looking at an old one?
Should i reset the PCM after installing the new one?
Thx in advance
Senior Member
True Car Nut
Joined: Nov 2002
Posts: 6,042
Likes: 5
From: Texarkana, Texas
It measures the amount of oxygen in the exhaust air to compute the A/F ratio.
Because if it fails lean, the PCM will richen the engine to no end.
Somewhat, But not reliably.
Yes.
Because if it fails lean, the PCM will richen the engine to no end.
Somewhat, But not reliably.
Yes.
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