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How many calalytic converters are on my 2003 trailblazer

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One. Unless you have installed a dual exhaust system in which case there should be one for each bank.

Posted on Mar 19, 2011

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Posted on Jan 02, 2017

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I have a 2003 trailblazer with 4.2 engine. Losing power when driving especially when going up hill (even small hill). Will drop down to 15 mph. got a code of p0172. Replaced O2 sensor and the...


Yes , it is more then likely the Catalytic converter is clogged ! Pull the O2 sensor before the Cat an do a back pressure test ! Testing for plugged clogged restricted exhaust converter An your P0172 means you have a rich condition , does not mean O2 sensor is bad ! Do you have 4.3 L vortex ? Could be bad fuel pressure regulator leaking ! caused your cat to have a melt down an starting to plug ! 4.3L or 5.0L vortex engines . with spider injectors ! chevy vortec p0172 p0175 So you have two problems ! Hope this helps !

Mar 09, 2015 | 2003 Chevrolet TrailBlazer

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How to reset check engine light


This isn't as easy a answer as it may seem, there are a lot of variables involved. There are 2 ways to reset the check engine light.
1) Fix the reason it came on in the first place.
2) Get a OBD 2 engine diagnostic computer, to turn it off. (these can often be borrowed free from a auto parts store)
The 5 main reasons the engine light goes on in the first place are;
1) O2 Sensor
2) Faulty or loose fuel cap
3) Calalytic converter
4) Mass airflow sensor
5) Spark Plugs and Wires
Numbers 1,2,and 5 are relatively inexpensive with most cars, the other 2 can be pricey..

Sep 04, 2014 | Cars & Trucks

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Reduced Engine Power light, rough idle


Hello TMAF...

TRIED most of that TOO...

Finally my codes... said the OXYGEN SENSORS were complaining... OBD... DTC
(on-board-diagnostic... DIAGNOSTIC TROUBLE CODES)

So... of course I changed the... OXYGEN SENSORS.

The "NEW" OXYGEN SENSORS complained just as well...

I have subsequently learned the "SENSORS" are
just doing their job...

In my case reporting on a collapsed catalytic converter.
(muffler is actually a MORE common blockage).

A little hunting around... like Auto-Zone ... Napa auto...
Pep-boys... O'Reilly Auto Parts... even MIDAS might
yield FREE READINGs... (check around).

Just remember to wear your best SALES RESISTANCE...

and look up you prices on ROCKAUTO...
before you go... Hope this helps.

(Unless FREE, I'd make a SPECIAL note (YELP) on
that "shop"... THEY ARE CLOWNS...!!
(in my humble opinion... not MECHANICS)).

ROCKAUTO
2003 CHEVROLET TRAILBLAZER 5 3L V8 Catalytic Converter RockAuto

2003 CHEVROLET TRAILBLAZER 4 2L L6 Catalytic Converter RockAuto

Carnac the Magnificent

May 28, 2017 | 2003 Chevrolet TrailBlazer

1 Answer

My 2003 Chevy Trailblazer suddenly started running rough and stalling, It smelled like fireworks.


1st things first, clean your throttle body. Also, that smell is concerning, have a muffler shop do a back pressure test on the Catalytic converter.

Jan 23, 2012 | 2003 Chevrolet TrailBlazer

1 Answer

I have a 2003 Chevy Trailblazer with a malfunctioning tachometer and speedometer. What is the likely part I need to replace?


Sounds like a bad speedometer sensor. Usually located on the transmission. The only way to fix the speedometer is to replace the sensor.
The Variable Speed Sensor (VSS) has failed. You will have to get it replaced. Both are driven by an electrical signal sent to the cars computer by the VSS, and converted to SPEED, and DISTANCE driven.

Aug 22, 2011 | 2003 Chevrolet TrailBlazer

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Is it true that I will need to order a manufacturers catalytic converter for my 2003 Chevy Trailblazer EXT with a V-8? Also are there two converters on my vehicle and that if one is damaged and needs...


You can use an aftermarket catalytic converter.
If one is damaged, the other does not need to be replaced.
I would seriously get another estimate somewhere else. I don't know your area but that seems very high for replacing one catalytic converter. That might be reasonable for two.

Oct 20, 2010 | 2003 Chevrolet TrailBlazer

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Im getting a sulphur smell and my trailblazer is runing rough and dying occasionally . it only has about 63000 miles so i i was wondering if it might be the cat converter ? or something else . i thought...


It shouldn't be the converter, more like an oxygen sensor. That is what is making the sulfur smell. To get closer to the problem take it to the parts store where they have a scanner and see what comes up. It is probably an easy fix. Hope this helps.

Jun 08, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Tranny in 2003 trailblazer


there are 4 solenoids in the trans, three shift and one torque converter clutch solenoid. Solenoid B is 2-3 shift solenoid.

Apr 07, 2009 | 2003 Chevrolet TrailBlazer

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