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Im the one with the 2004 chevy avalanche 2wd, can i see a diagrahm of where both o2 sensors are?

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They are in the tail/exhaust pipe .

Posted on Dec 02, 2016

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How do you reset engine light 2004turned chevy avalanche


need scanner light comes on for reason thats what the codes are for they help see whats caused the fault to turn on light
and it can be anything loose gas cap bad o2 sensor missfire
90% is loose gas cap rule of thumb if the way it drives does not change dont panic, if engine shakes n shudders get checked quick
if fuel mileage is suffering get it checked n fixed soon burnin money!!

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This code keeps coming up we changed the o2 sensor and put new plugs and wires on. The truck is hesitating and seems to lose power going up hills and is now smoking. It is a 2004 chevy avalanche.


This could be due to the wrong O2 sensor, Bad Catalytic Convertor, EGR valve or something along those lines. Did you replace this with an OEM part and not have to change the wiring harness or did you have to change the wirings? The other most common issue is you changed it with a non-OEM product and the O2 sensor is not reading correctly. Check to make sure wires are hooked up correctly. Also not know the details of this vehicle it can be that you changed the wrong O2 sensor also, most vehicles have an O2 sensor before and after the Catalytic Convertor

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Went to autozone got code p0420 what do i check 2002 chevy avalanche


That's an oxygen sensor/converter issue. When the (2) O2 sensors read exactly the same readings (one either side of converter) means converter is bad.

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those pushbutton switches are known to be bad, local wrecker should be able to supply you one .

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You need to have it scanned. It sounds like a bad speed sensor in the transfercase.

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