Replaced O2 Sensor, now won't start

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Apr 21, 2012 | 01:12 PM

bigcozy

Thread Starter

Newbie

Joined: Apr 2012

Posts: 5

Likes: 0

Model: Cherokee

Replaced O2 Sensor, now won't start

2001 with 6 cylinder with california emissions and 4 O2 sensors. Rough idle, surges at 70 mph, check engine light comes on. OBD reads O2 sensor bank 2 sensor 2. Drive for week, light comes back on, have OBD read again to make sure its the same thing, it was. Replaced 02 sensor today (major pain in the a$$) and now it will not even come close to starting. Made sure my connections were good, eveything looks right. HELP!

Apr 21, 2012 | 04:18 PM

Bustedback

CF Veteran

Joined: Feb 2010

Posts: 12,367

Likes: 23

From: Oroville, CA

Year: 1995

Model: Grand Cherokee

Engine: 4.0 with all of the noise and clatter

Make sure the O2 sensor wires are not melted the the exhaust and causing a fuse to blow.

Apr 21, 2012 | 04:49 PM

bigcozy

Thread Starter

Newbie

Joined: Apr 2012

Posts: 5

Likes: 0

Model: Cherokee

New NTK sensor is fine, pulled it out. Replaced it with the old one and engine fired up immediately. Double checked part number, its correct.

Apr 21, 2012 | 05:05 PM

E-Rok

Senior Member

Joined: Oct 2010

Posts: 842

Likes: 4

From: Everett, WA

Year: 1996

Model: Grand Cherokee

Engine: 5.2L

weird, it should still start even with the 02 sensor unplugged

Apr 21, 2012 | 05:22 PM

bigcozy

Thread Starter

Newbie

Joined: Apr 2012

Posts: 5

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Model: Cherokee

That is exactly what I would think to.

Apr 23, 2012 | 03:53 PM

GI-Jeepin'

Senior Member

Joined: Dec 2010

Posts: 786

Likes: 1

From: Virginia Beach

Year: 2016

Model: Grand Cherokee (WK2)

Engine: 5.7l HEMI

I have the same vehicle, 01 GC, 4.0l CA Emissions w/ the 4 O2s. When I got the code to replace them, I also had a fuse blow out on mine. Dont remember the name of the fuse but it was in the O2 sensor circuit. May want to check that.