Question about 2003 Chevrolet Impala

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My 2003 impala has terrible gas mileage and I've replace the Cat Converter and back ox sensor

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You my have a problem withe transmission or the clutches in it.

Posted on Mar 24, 2011

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2003 impala. Hard starts and fumes smell.


this is what i found for you

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensorwaveform reading should fluctuate. The downstream O2 sensoricon1.png reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Most likely, the aftermarket cat they installed is a high flow cat. This commonly causes issues with throwing that code on our cars. You can either have an OE cat installed, or just have the code deleted from the PCM by someone that has a tuner.
Good Luck

Jan 10, 2013 | 2003 Chevrolet Impala

1 Answer

I have a 2000 Chevy impala with 131,500 miles on it. For some reason it's using more gas then normal. I had a new fuel filter and fuel pressure regulator put on it and still same thing. Can't see...


catalytic converter, egr valve, oxygen sensors. If you have that many miles on it, try loosening the exhaust before the cat converter and try driving it. If your power has come back, then it has failed internally.

Jul 20, 2017 | 2000 Chevrolet Impala

1 Answer

Had 3 codes come up for ox. sensor..po155-po151-po153 which one to replace and exactly where located?


it is the o2 sensor in front of the cat converter jack up truck and support under truck locate ur cat converter do this with truck cold cat can burn skin very easily same with exhaust pipes .when locate converter follow pipe forward towards engine look toward top of exhaust pipe will see a small tube with wire connected this is problem sensor check wiring and connector un plug and remove replace than reconnect

Oct 24, 2011 | 1999 Ford Explorer

4 Answers

If I cut the Cat converter off my 2004 trail blazer well it still run


Yes it will still run. But running w/o a cat is illegal. And you will fail any emissions test. Also you will lose gas mileage. Hope this helps, James Booth

May 17, 2011 | 2004 Chevrolet TrailBlazer

2 Answers

2003 Grand Am: Just replaced egr valve car has and cleaned maf se...


Symptoms....car throws a check engine code for the EGR valve.... car has noticeably less power (especially on the highway)and fuel mileage is noticably worse.
Cause....catalytic converter.

May 17, 2010 | 2003 Pontiac Grand Am

3 Answers

I have a 2003 chevy impala that bogs down when accelerating. Computer diagnostics are fine. Fuel line pressure test was fine, no gas leaks. No ck engine light on. Need suggestion what to do next. Dad says...


Start with the simple and replace the fuel and air filter, also check the fuel pressure regulator vacuum line and clean the MAF sensor with MAF cleaner. Start with these easy things to check and hope will bring your car back to running 100%.

Dec 11, 2009 | 2003 Chevrolet Impala

2 Answers

I have a Honda Accord 2003, how can i fix a downstraem Oxygen sensor.. does this affect the gas cosumtion performance.. how can i fix this.. Help.!


o2 sensor is very important part to the engine when it come to the fuel economy. o2 sensor send information to the computer (ECU) which compute and calculate ratio of burnt exhaust gases. if the engine is not run properly either is too lean or too rich the o2 sensor will detect it as the car will triger the check engine light. you can drive the vehicle which will not hurt it as long you can tolerated the light however the car will get terrible gas mileage and poor performance as the ECU will try to lean the engine out itself. o2 sensor is fairly cheap to replace and fix. Let assume the car get 30 mpg on the high way, running with check engine light/bad o2 sensor will change the gas mileage to 18-25 mpg. If the car is V6 make sure you replace o2 on both side. good luck!

Nov 23, 2009 | 2003 Honda Accord

1 Answer

My 1996 F150 with the 300ci, 4.9liter inline 6 with auto trasns.and overdrive gets terrible gas mileage.12-13 mpg. Doesn't trip any trouble codes, ox sensors all tested good. Had the truck 3 years now....


your milage won't get much better than around 20 mpg at the best of times but you may have a partially plugged resignater or catalytic converter.you can check these with a digital thermomiter by checking temps. in and out of these,they should be close to the same.

Sep 24, 2009 | 1996 Ford F150 Regular Cab

1 Answer

My jeep does the same thing


bad ox sensor or o2 sensor connections most of the time, most of these have 2 of these one ahead of cat converter, one after the cat converter

Nov 25, 2008 | 1998 Jeep Cherokee

1 Answer

2000 hundai accent engine light


sorry dealer only ,this information is not published ,go to dealer and lay the golden egg ----owing to complexity of the anti-theft systems and not allowing this information for general use to stop car theft ??well thats the excuse anyway .do you know a good solicitor who can sue them under the freedom of information act you have stateside .because in europe the problem is acute with no re -address.. .software encrypted so if you try to read it it just show anything with a general mechanics reader .are you preparing the golden egg ??ready for the dealer ??my advice if it runs ok leave well alone and throw you scan master or digisoft reader in the bin as it will not work on modern cars and the newer the car the less you can do with it.

Nov 18, 2008 | 2000 Hyundai Accent

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