O2 sensor heater circuit malfunction

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Nov 25, 2004 | 10:02 PM

SAR Roy

Thread Starter

Freshman User

Joined: Oct 2004

Posts: 37

Likes: 0

O2 sensor heater circuit malfunction

Hello all,

Every once in a while (seems like when it rains.. and it rains alot on the wet coast of Canada) my 1997 F-150 with the 4.2 V-6 (not the original engine-a Ford Quality Renewal engine) throws on the check engine light. Check the code and PO 135 - O2 sensor heater circuit malfunction (Bank 1, sensor 1) and PO 155 (O2 sensor heater circuit malfunction (Bank 2, sensor 1) comes up. Ignore the light for a few trips and it turns itself off.

Now the questions...
Is the sensor heater a part of the O2 sensor?

Need I worry about this since the check engine light resets itself when things dry out?

Is there a way of sealing the sensor better?

Thanks for your help!

Cheers,
Roy in Mission, B.C.
Canada, eh?

Nov 26, 2004 | 01:33 PM

JH6

Senior User

Joined: Jul 2004

Posts: 221

Likes: 1

i would replace the two front o2 sensors and call it a day.

JH

Nov 26, 2004 | 01:45 PM

RoyalFord

Elder User

Joined: Apr 2004

Posts: 866

Likes: 2

From: North Carolina

I would also change both upstream O2 Sensors. The rain probably isn't doing anything to the sensors, it is probably the humidity.

Nov 26, 2004 | 03:56 PM