Question about 1997 Jeep Grand Cherokee

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My problem is malfunction code 51 and if I have bad convertor does this result code 51ode

Does bad convertor or muffler result code 51 because o2 sensors are good condition

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Code 51 is a lean code and is not caused by a converter most likely a vacuum leak is causing this problem if the engine seems to run fine inspect vacuum hoses and intake gaskets for leaks or breakage

Posted on Dec 10, 2012

Testimonial: "thanks for a lot as soon as I will check the vauum hoses "

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Posted on Jan 02, 2017

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SOURCE: 96 grande cherokee 6cyl. replaced o2 sensor and

Sounds more like an ignition misfire. Sometimes also, an exhaust leak in the pipe above the sensor can add enough air to cause the mixture in the pipe to ignite and cause the same problem. The first "weak point" in the exhaust is the muffler which is why it blows it up. Cutting out the cat will not solve this.

Posted on Oct 29, 2009

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SOURCE: 2.5 4 cyl engine Code P0171....Black Soot in the

Black soot in water? You mean water in the tailpipe or black soot in the coolant in the radiator? Have you tested the manifold air temp sensor and the throttle position sensor? If they were OK, you may just have worn injectors that are allowing a bit too much fuel flow or a bad spray pattern. In the meantime, you could try replacing the plugs with a set that is one heat range hotter. If the plugs become slightly fouled, that can cause a snowball effect which makes the situation worse.

Posted on Nov 12, 2009

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SOURCE: 1996 Jeep Cherokee. O2 sensor problem.

i would check with the dealer who changed the converter to check and see if the sensors were damaged while they replaced the converter or may be they have forgotten to hook it back up check before you throw away your good 02 sensr

Posted on Nov 12, 2008

iambanshee74
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SOURCE: a few weeks ago i installed a air intake and

My first question would be, "did you disconnect the battery before welding the exhaust?" This could fry the ECU. What codes are you retrieving now?

Posted on Mar 08, 2010

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1 Answer

Where is the O2 sensor located on and


look underneath at the exhaust pipe. after it comes off of the engine and starts back towards the rear of the car, you will see 2 muffler-looking parts close to the front. there will be o2 sensors on either side of these, which are called the catalytic convertors. Are you experiencing intermittent check engine lights? symptoms of a bad o2 sensor is the light will come on and off occasionally and poor fuel mileage. Sometimes you will get a clogged catalytic convertor which will make your o2 sensor foul up. you'll get a sulfur smell out of the exhaust when this happens.

Oct 11, 2014 | Cars & Trucks

4 Answers

I have 96 buick code p0420.I have replaced the converter and both 02 sensors.mil came back on code p0420. do not know what to do next, help.


fault code that is set when the Onboard Diagnostic II (OBD II) system sees a drop in converter efficiency. The OBD II system monitors catalyst efficiency by comparing the switching activity of the upstream and downstream oxygen sensors in the exhaust. The upstream O2 sensor in the exhaust manifold reflects the condition of the exhaust gases as they exit the engine. The downstream O2 sensor in or behind the catalytic converter reflects the condition of the exhaust after it passes through he converter.

Aug 02, 2008 | Buick Regal Cars & Trucks

2 Answers

2005 BMW 325I CODE 171 174


It means too much O2 in the exhaust gas. It could be a leak between the engine and catalytic convertors in the exhaust pipes, bad sensors (they are in a very hot place and do go bad), bad catalytic convertors, and a few other problems. If you don't want to go to a qualified mechanic to find the exact reason, you can start with the cheapest repair and work your way up to the most expensive repair.
A reputable muffler repair shop is a good place to go since most of the causes for these codes are part of the exhaust

May 24, 2014 | 2000 Ford Windstar

1 Answer

Check engine light comes on every 200 or so miles, code P0420. O2 sensor has been replaced. I read that there was a bad batch of catalytic converters in this model. Any other easy tests or fixes?


p0420 is set when the convertor is unable to store oxygen in the minerals used in the convertor. the lack of oxygen to mix with the exhaust gases causes the O2 sensor to set the code. if the O2 sensor has been replaced the only other thing to do is replace the convertor. you can check with the Subaru dealer and let them run your VIN to see if you had one of the defective convertors.

Aug 01, 2011 | 2001 Subaru Outback

3 Answers

I've got a 1996 Suburban 5.7 engine that came up with a code P0141. What's the problem. Please advise. Frank S


P0141 is HO2S-12 (Bank 1 Sensor 2) Heater Circuit Malfunction.

What this means is the oxygen sensor AFTER the catalyitic convertor is malfunctioning. This is a "heated" sensor and that portion is bad. You have to replace the sensor as the heating element is part of the complete sensor.

Jan 31, 2011 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

12 51 55 codigo de error


12 just means the system was reset recently 55 mean end of codes so don't worry about them 2 however code 51 is an oxygen sensor error (O2 Sensor) a bad or shorted O2 sensor can cause it to run very bad and get poor gas mileage.

Nov 10, 2010 | 1994 Jeep Grand Cherokee

1 Answer

2001 dodge durango 4.7liter 4x4 i replaced front o2 sensor,rear 02 sensor,ground wire to exhaust and the engine light keeping coding saying (o2 sensor heater curcuit malfunction bank 1 sensor 2). car runs...


bank 1 sensor 2 is the left downstream sensor (1/2) is located in the exhaust downpipe just after the mini-catalytic convertor, and before the main catalytic convertor. Now the meaning of this is that your not getting any 12+/12- heating on sensor, which means voltage is supplied to heat sensor up. You have a O2 sensor heater relay, but not getting problem with 2/2 sensor tells me you need to check/inspect the wiring for 1/2 sensor, open wiring for 1/2 sensor and inspect

Feb 07, 2010 | 2001 Dodge Durango

1 Answer

Code po420 keeps popping up it says its a left bank catalyst failure i took it to a muffler shop and wAS TOLD THRE IS NOTHING WRONG BUT THE LIGHTS STILL ON


make sure that O2 sensors are good if access to scanner look at live data and if both O2 sensors are switching about the same the catalitic convertor should be replaced

Nov 14, 2009 | 2003 Jeep Liberty

1 Answer

97 intrepid check engine light...


something else
you have to have all of the original system in place for the ECM program to operate properly
removing for convenience is not the way to go as it will throw up codes and upset the economy of the vehicle

Jun 24, 2017 | 1997 Dodge Intrepid

2 Answers

I need to know what the definition for fault code


The #2 O2 sensor on the cataylitic convertor,could be caused by a bad sensor or bad convertor.

Jun 22, 2009 | 1998 Jeep Cherokee

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