Question about 2001 Jeep Grand Cherokee

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2001 Cherokee 4.0 6cyl -- P0161 and P0158 codes

2001 Cherokee 4.0 6cyl
P0161 and P0158 ...runs ok but ~18 mpg down from 20-22 for most of its 125,000 miles. Engine gets confused sometimes when just strated...chuggs, sputters...clears up and ok albeit with poor mileager and throws the codes again. How do you approach diagnosing this?

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If you do not know what the codes are, it is O2 sensor. This means the computer is not reading the right information from the faulty sensor. (there is a set range the sensor is meant to show, if one goes over or under the computer shows check engine). The diagnostic is not too bad, give the car a tune up, plugs, wires etc. and replace the O2 sensor. This normally clears up any problems. Let me know if you need further clarification or help.

Posted on Sep 28, 2009


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2006 jeep cherokee have these codes p0031,p0138,p0141,p0158,p0161,p0455,p0456,p01281

very old post
the FSM , factory service manual of all cars made
answers that.

or log in and read
those coders are errors, and the tech. does more tests to find true cause.

Jul 18, 2014 | 2006 Jeep Grand Cherokee

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2000 Jeep Grand Cherokee codes p0132 p0141 p0152 p0161 Keep Coming Back

Then the problem, is not fixed and needs further diagnosis using special equipment..

May 31, 2013 | 2001 Jeep Grand Cherokee

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o2 sensors or crank sensor or cam sensor wires plugs coil iinjectors not the whole rail control modul or even on these jeeps i found it can be a bad computer or maybe you need a new wiring harness or one wire some where is broke takes time to fine but when you do and its fixed good job goodluck.

Dec 02, 2012 | Cars & Trucks

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Jeep Cherokee went from 18 MPG tp less Than 8 MPG over night.

There are several items you can check there. Your temperature sender if bad can make the computer think the engine has not reached normal temp, causing the computer to add extra fuel, Your MAP sensor can do much the same thing as can the Throttle position sensor. I'd also check the fuel pressure regulator as default is to a higher pressure than normal.
Manifold air temp and O2 sensors can do that too, but normally not that drastic of a difference.
Testing can be done using a digital multi meter and a haynes or chilton manual as a guide. Begin by having a code scan done (most larger parts stores do that free). Also, make sure the fuel system and lines aren't leaking anywhere...that can use up lots of fuel as well.

Jul 29, 2010 | 1994 Jeep Grand Cherokee

1 Answer

1999 jeep grand cherokee. p0152, p0141, p0161

All 3 codes are point to the o2 sensor
the one you want to replace is on the exaust manifold looks like a spark plug with a wire sticking out of it un plug the sensor and it turns to the left to get off install the new one and plug the new sensor in

Jul 14, 2010 | 1999 Jeep Grand Cherokee

1 Answer

I have a 2001 Jeep Grand Cherokee - Limited My

That's a generic O2 sensor circuit overvoltage warning. Did they find any additional codes? Also, did they clear the code for you? Your car is an OBD2-emissions car, meaning you'll have an O2 sensor before and after each catalytic converter. Is your engine the V8 or the inline 6? If it's the V8, you'll probably have four (although it could be two or three) O2 sensors. If it's the inline 6, you likely only have two. I'm asking about additional codes because that one doesn't help narrow down which sensor is bad. Have you noticed your gas mileage dropping at all? Or a buildup of black carbon soot in the tailpipes? Maybe less power than usual? If so, it's probably a primary (pre-cat) O2 sensor. Those are the ones that determine how much fuel the engine will be fed. If you don't have any discernable difference at all, it's probably a secondary sensor (post-cat). The issue I have is, either of those should throw at least one additional code (either to indicate which sensor is going bad, or in the case of a secondary sensor, you'll usually see a "catalytic converter below threshold" or similar code, since the secondary sensors are used by the computer to see how well the cats are working).

Any additional codes in there, or symptoms you can describe?

Nov 11, 2009 | 2001 Jeep Grand Cherokee

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I have a check engine light with P0161 Bank2 Heater circuit malfunction which one is bank 2, help.

Bank #2 is where your #2 cylinder is and that is on the passenger side. Good luck and hope this helps, keep me posted be glad to answer any question you may have. 

Jul 03, 2009 | 2001 Jeep Grand Cherokee

2 Answers

2001 Grand Cher

im not sure sounds like my problem but my 2001 grand ch.does it only from the right half of the vents .i heard it was the code p0161 o2 2/1 heater circuit oxygen sensor heater element malfunction code p0158 o2 2/2 shorted high oxygen sensor input voltage maintained above the normal operating range

Jul 22, 2008 | 2001 Jeep Grand Cherokee

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