Question about 1994 Jeep Grand Cherokee

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Chek engine sign

I change the oxygen sensor and keeps telling me tha I have the same problem, it uses a LOT of gas so I think that the computer is not getting signal from the sensor, Where can I get a diagram of the oxygen sensor to the computer??? thank you

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  • Jeep Master
  • 17,970 Answers

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Posted on Jul 10, 2009

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1 Answer

Why is there is no power when you step on the gas and it is using a lot of fuel


your oxygen sensor ( O2 ) has probably failed , the engine computer can no longer read it .
the computer probably believes that the engine is running lean and pumping more fuel into the cylinders to compensate
only a computer diagnostic tool can tell for sure

May 28, 2014 | 2002 Buick Regal

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Service engine light stays changed gas cap done smoke test replaced oxygen sensor


Code 449 is for a defective vent valve solenoid. The engine computer can not open or close the valve or can not tell if the valve is operating.
The valve/solenoid would need to be tested and you will probably need a shop manual to get the testing procedure.

Mar 06, 2014 | Cadillac DeVille Cars & Trucks

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Poor gas mileage


Check Oxygen sensors. There are 2 of them and not very costly. should be $20-25 each. But if oxygen sensors are bad, you should have 'Chek Engine' sign on. Do you get Check Engine Sign ?

Aug 14, 2012 | 2002 Buick Century

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Iput a new alarm sistem on my 2005 odyssey and chek engine light came on, code p 0420


P0420 = catalyst efficiency below threshold (bank 1)

I think it is a coincidence that the check engine light came on with this code at the same time as you installed the new alarm.

the power train control module or computer checks the output of the oxygen sensors (pre-catalyst and post-catalyst) and compares them. When the post-catalyst sensor output starts to resemble the pre-catalyst sensor output with little difference, the computer sets the catalyst efficiency code. Check the output of the oxygen sensors. A worn out or lazy oxygen sensor might be at fault. If the sensors check okay, then the catalytic converter may need to be replaced. This is unusual for a 2005 unless the engine has been having misfires. Raw unburned fuel will quickly destroy a catalytic converter.

Feb 27, 2011 | Honda Odyssey Cars & Trucks

1 Answer

I have an 03 cruiser a/t turbo that is getting terrible gas milage. Can I do anything to correct this? The car only has 70,000 miles on it and with 12-15 mpg i now know why


sometimes it also contribute from driving habit especially on how to use tha gas pedal, you need to check that your tires are in good amount air, you also consider the road and your baggage inside your car, anyway if you run your vehicle in a normal usage, i think you need to chek the following; 1) check your air filter, 2) your oxygen sensors, 3) catalytic converters, and 4) engine thermostat (malfunction), all these are related for emmision, if you have a OBDII scanner the better you can identify your specific problem...hoping it can help you..good day

Feb 05, 2011 | 2006 Chrysler PT Cruiser

1 Answer

I have a 2001 jeep grand ckerokee with the small engine light staying on all the time. I have replaced 3 of the 02 sensers, new manifold,new muffler for the 02 reading, replaced the thermostat, and the...


The best advice that I can offer is to have your Engine computer scanned and diagnosed by a qualifed sevice technician and find out why the Engine Computer is turning the light on. If the light is on, it is because the computer has stored one or more fault codes. Fault codes NEVER tell you what parts to replace. They only tell you that one or more of the many systems monitored by the computer is operating outside of its expected "Range" or "Window of Operation". It is up to the person performing diagnosis to test the system that is failing and determine the actual cause of the failure and repair as necessary. You can spend a LOT of money replacing a LOT of parts and NOT fix the problem if proper diagnosis is not performed. Fault codes for the Oxygen sensors are RARELY caused by the Oxygen Sensors themselves. Oxygen Sensors are like informers. When someone within the engine management system is not performing their job, it is the Oxygen Sensor's job to rat them out. Replacing the Oxygen Sensors will only cause the new sensor to tell on the same problem. So, in your case, if you have replaced 3 of the Oxygen Sensors, that means that 6 Oxygen sensor have all been trying to tell you that there is a "Slacker" in the ranks! Stop wasting your money and fire the fool!

Jan 22, 2011 | 2000 Jeep Grand Cherokee

3 Answers

The check engine light keeps turning on after I have the oxygen sensor replaced. I've had the sensor replaced 3 times as the light keeps turning on and the shop keeps telling me that that's the only thing...


are they replacing the correct sensor? try bringing it to a vw specific shop that is not a dealer! make sure the air filter is not clogged. without doing a full scan in vag-com it would be very hard to diagnose the problem

Jan 17, 2011 | 2004 Volkswagen Jetta

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I have a 1997 Grand Jeep Cherokee it was produce the last half of the year. I was informed that there was a difference in the first half and last half of that year. I have had numerous work done to the...


You need to find a repair shop that can figure out the problem. dont waste anymore time and money guessing what to replace next. Find a shop that does a lot of Chrysler/Jeep work, they will have better scanners and techs than a general do it all shop.

Dec 06, 2010 | 1997 Jeep Grand Cherokee

1 Answer

My 2001 Rav4 engine light keeps coming on. We had it hooked up to a computer and it said that it was "running lean". The suggestion was to change the spark plugs and the oxygen sensors. We have changed the...


It sounds like you have a large vacuum leak after the mass air flow sensor. This would induce a lean running condition and could cause a stall. Check the rubber air intake bellow for cracks or tears. Also check for disconnected or broken vacuum lines.

Oct 04, 2010 | 2001 Toyota RAV4

1 Answer

1 have put in about £25.00 in petrol and only get about 70 miles before i run out and the petrol light always seems to be on red


Change out the primary oxygen sensor(s) - these are the ones on the exhaust manifolds, between the engine and catalytic converters. They're the computer's main source of information when it comes to the car's air/fuel mixture, and when they start to fail, the car will default to a rich-running situation, dumping extra fuel into the engine to safeguard it. You'll probably notice a lot of black carbon buildup in the tailpipe, and possibly less power than you're used to. That's a sign of a rich fuel condition, and changing the oxygen sensors is the typical fix.

Jul 12, 2010 | Cars & Trucks

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