2003 Jeep Liberty Check Engin Light ON

TWEETYNY

MEMBER
2003 JEEP LIBERTY
6 CYL
4WD
AUTOMATIC
83,005 MILES

AutoZone tech diagnose with his computer and he find out error code P0133.
After that check engine light get OFF. But next day when I was on highway then check engine lgiht turn ON again. Here is the error code definition and explanation.
Definition:
6BH02s11 slow response (heated oxygen sensor bank 1 BBsensor1)
Explanation:
BBThe powertrain control module uses the oxygen
BBsensor to calculation the Air/Fuel ration in the BBexhaust.

When I checked in service manual they said v6 engine has 4 oxygen sensors.

Upstream
1. Right Upstream sensor (2/1)
2. Left Upstream sensor (1/1)

Downstream:
3. Left Downstream sensor (1/2)
4. Right Dwonstream sensor (2/2)

but i am not sure where exectly bank 1 location.

Could someone please help me.

1 Reply

ATKAPARKING

MEMBER
64 POSTS

I don't remember the cylinder location on this engine, but bank one is the head with #1 cylinder at the front.

If this were my vehicle, I would replace both upstream o2 sensors. The computer is set up to display this code when the sensor signal is at 15% variance from standard reading. (If vehicles operated at 100% they'd constantly set check engine lights). O2 sensors fatigue and are a overlooked part of a tuneup. If one needs replaced, the other is probably not far behind. It may already be operating at 10% less than the efficiency of new, and the computer will not alert you to this until it hits that 15% threshold.