Question about 2002 Chevrolet Impala

1 Answer

Code p0240 comes up AGAIN!! This is what has been done. Replaced #1 o2 sensor, no luck.Replaced #2 o2sensor. No luck.Replaced t-stat( not comming up to temp) ok! Passed inspection! I haven't yet pulled the spark plugs to see if there is an antifreez leak from a partialy blown head gasket (bank 1). Where do I go from here? signed, just short of selling car. Thanks

Posted by on

  • petey49 Oct 13, 2010

    This story get's deeper, bear with me please. Last winter our 02 chev Impalla had leaking intake manafold gaskets( Internally as well as externally) Very common problem for the 3.4 v 6. Not having a semi warm place to work on it I brought it to our mechanic. He did the repair, we went to pick it up and the car ran terrable. Had it towed back and he wanted to replace the Cat. Ok. All said and done to the tune of1200.00$ Months go by and all is well the CEL comes on again. Wife can't be without a car she runs it till it comes close to inspection time. So I replace #1 o2 and seems ok. Later same code as above again. Bring the car to the same shop and he replaces same #1 o2 and still no good. He changes out #2 O2,no good again. I'm now running the car through drive cycles. At this point I'm tapped out in the money department. The mechanic showes me how to replace the T-stat. Book time 2 hrs 250.00 cost in labor. I did it in 1.5 hrs. Now car temp is ok and passes inspection. The mechanic passed the car.

  • petey49 Oct 13, 2010

    Yes I see what you mean about the T-stat code. In the freeze frame the car was running at a temp of 190. The stat spec 195. Would the pcm see that difference? And if so would I think that code would come pop up.

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,450 Answers

Are you sure this is the proper code? i am showing a code 240 does not apply to your vehicle. this code is a catylitic convertor efficency code meaning the convertor is not doing its job and needs to be replaced

Posted on Oct 13, 2010

  • 1 more comment 
  • TripleTauto
    TripleTauto Oct 13, 2010

    a code p0140 seems like what you have will need to have a scan tool to read datra parameters and see what 02 is reading since you have replaced 02 it is either a wiring problem or a bad pcm

  • TripleTauto
    TripleTauto Oct 13, 2010

    well the thermostat code is p0128 . gm does not show a p0240 pertaining to your car so double check the code and i can assist you.

  • TripleTauto
    TripleTauto Oct 13, 2010

    sometimes they will sometimes not usually wont set code if running 190, as for your 02problem i think you have a wiring issue or a problem with pcm. try tighening all your engine grounds

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Where is the O2sensor bank 1 at with a code of P0420. AND do I need to replace both sensors upstream and down. Or just the one that is showing up on the obd scanner.


Bank one is front side of cat. It should also tell u if it's cat 1 or cat 2. Depending on make an modle an yr. Catalyst 1 bank 2 is left cat back sensor. Catalyst 2 bank 2 is right cat back sensor. U do not have to replace upstream also. My o2 sensor Catalyst 2 bank 2 went bad. Had engine code for burning rich bank 2. Replaced tha down stream sensor an fixed problem runs better an better gas. This was in 97 gmc suburban. Idk what vehicle ur askin about. An I'm not to familiar with much about cars jus trucks an suvs.

Jan 02, 2017 | Cars & Trucks

3 Answers

I have a 2007 jeep commander code P0153 O2 sensor slow response( bank 2sensor 1) replaced O2 light came back on later that day same code replaced O2 sensor again later that day check engine back on


What type O2sensor did you use ? Aftermarket ? Jeep's ,Chryslers , dodge are picky . WARNING Aftermarket Oxygen Sensors Chrysler part 1 Did you test or just replace the O2 sensor . P0153 Jeep O2 sensor 2 1 Slow Response If you don't have the tools like this guy uses an have the know how it's tough to fix problems like this .

Mar 24, 2016 | Jeep Cars & Trucks

4 Answers

Code p0153..p1153


Rowland, Code p0153 Faulty oxygen sensor.
http://www.obd-codes.com/p0153
Code p1153 Probale faulty oxygen sensor.
PCM detect less than 55 lean to rich or rich to lean switches
P1153 OBD Trouble Code

Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

Mar 21, 2016 | GMC Cars & Trucks

1 Answer

What could cause my bank 1 O2 sensor to keep going bad


For the code pulled was diagnostic trouble code diagnostics done or was the O2 sensor just replaced > What was the code # P0xxx what . There are a number of codes for the O2 sensors on cars . They don't say replace the O2 sensor . diagnostics must be done , electrical circuit testing , plus other tests

May 16, 2017 | Jeep Cherokee Cars & Trucks

2 Answers

Where is the o2 sensor on 2005 ford freestar 3.9


o2sensors are located in the exhaust system.you have 4 o2sensors on your car.so you need to know which sensor your looking for.bank 1 sensor 1 is the first sensor in the exhaust pipe on the side cylinder 1 is on.bank 2 is on the side cylinder 2 is on.then you have a sensor before the catalytic convertor and one after the convertor.

Nov 01, 2011 | 2004 Ford Freestar

2 Answers

2002 Ford Windstar Error Code P1131 And P1151


those two codes are for the o2 sensors. both are the upstream sensors on the front and rear banks. so they are desinagted bank 1 sensor 1 and bank 2 sensor 1. them most common cause for this is faulty o2sensors , bad gas and of a poor running engine. so if your car runs good (no misfire) and gas is ok then replace the o2sensor witch is the very most common cause.

Jan 28, 2010 | 2000 Ford Windstar

2 Answers

1998 honda accord check engine light on code p0141


SECONDARY HEATED O2 SENSOR HEATER CIRCUIT FAULT SENSOR 2.

Jun 09, 2009 | 1998 Honda Accord

2 Answers

Replace oxygen sensor


REMOVAL & INSTALLATION Start the engine and allow it to reach normal operating temperature, then turn the ignition switch OFF. Disconnect the negative battery cable. Open the hood and locate the O2sensor connector. It may be necessary to raise and safely support the vehicle for access to the sensor and its connector. NOTE: On a few models, it may be necessary to remove the passenger seat and lift the carpeting in order to access the connector for a downstream O2sensor. Disengage the O2sensor pigtail connector from the vehicle harness connector. NOTE: There are generally 2 methods used to mount an O2sensor in the exhaust system. Either the O2sensor is threaded directly into the exhaust component (screw-in type) or the O2sensor is retained by a flange and 2 nuts or bolts (flange type). WARNING To prevent damaging a screw-in type O2sensor, if excessive force is needed to remove the sensor lubricate it with penetrating oil prior to removal. Also, be sure to protect the tip of the sensor; O2sensor tips are very sensitive and may be easily damaged if allowed to strike or come in contact with other objects. Remove the sensor, as follows: Screw-in type sensors: Since O2sensors are usually designed with a permanently-attached wiring pigtail, it may be necessary to use a socket or wrench that is designed specifically for this purpose. Before purchasing such a socket, be sure that you can't save some money by using a box end wrench for sensor removal. Flange type sensors: Loosen the hold-down nuts or bolts and pull the sensor out of the exhaust component. Be sure to remove and discard the old sensor gasket, if equipped. You will need a new gasket for installation. Perform a visual inspection of the sensor. Black sooty deposits may indicate a rich air/fuel mixture, brown deposits may indicate an oil consumption problem, and white gritty deposits may indicate an internal coolant leak. All of these conditions can destroy a new sensor if not corrected before installation. To install: Install the sensor, as follows: NOTE: A special anti-seize compound is used on most screw-in type O2sensor threads, and is designed to ease O2sensor removal. New sensors usually have the compound already applied to the threads. However, if installing the old O2sensor or the new sensor did not come with compound, apply a thin coating of electrically conductive anti-seize compound to the sensor threads. WARNING Be sure to prevent any of the anti-seize compound from coming in contact with the O2sensor tip. Also, take precautions to protect the sensor tip from physical damage during installation. Screw-in type sensors: Install the sensor in the mounting boss, then tighten it securely. Flange type sensors: Position a new sensor gasket on the exhaust component and insert the sensor. Tighten the hold-down fasteners securely and evenly. Reattach the sensor pigtail connector to the vehicle harness connector. Lower the vehicle. Connect the negative battery cable. Start the engine and ensure no Diagnostic Trouble Codes (DTC's) are set. Posting pictures next......

Jun 06, 2009 | 2001 Toyota Tacoma

4 Answers

Dakota 4.7 P0161 code? What does it mean


P0161 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
check the wiring to the bank 2 sensor, that is the one behind the catalytic converter on the opposite side from the bank where #1 cylinder is located, see firing order diagram below.
a92549a.gif

Apr 30, 2009 | Dodge Dakota Cars & Trucks

3 Answers

Obd code P0240/ 2003 nisson murano


Do you mean P0420?? If its a P0420 you need a catalytic convertor.

Jun 18, 2008 | 2003 Nissan Murano

Not finding what you are looking for?
2002 Chevrolet Impala Logo

Related Topics:

648 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

74896 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7688 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...