Question about 2003 Chevrolet Silverado 2500HD

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Just had all 4 O2 Sensors replaced along with the Throttle Body, in my 03 Chevy 2500HD, have had my truck back 1 day, and the check engine light came back on and gave me codes PO140 and PO 160. What do I do now?

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O2 sensor circuit. No activity detected. Bank 2 sensor 2. Take it back to the garage. They did something wrong.

Posted on Oct 17, 2013


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6ya staff

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Posted on Jan 02, 2017



  • 14 Answers

SOURCE: Check Engine Light - O2 Sensor - bank 1 running lean

you should have three oxygen sensors on your car, one for each bank of three cylinders; should be towards the Y pipe on each exhaust manifold. Additionally you should have one on the exhaust pipe before the cadilitic converter.

Posted on Nov 20, 2008


  • 3 Answers

SOURCE: stalling, 'reduced power' light, and OBD code P1125 Manufacturer control air metering...

These trucks have a drive by wire system,we seen a` lot with a broken ground wire on the rear of the drverside cyl head,this is hard to see just feel and give the wire a tug .If the wire is loose or broken the reduced engine power light will come on.

Posted on Feb 15, 2009


steve golladay

  • 147 Answers


Possible failed bank 1 sensor 1 oxygen sensor..

Posted on Mar 29, 2009

Chris Yelton

  • 708 Answers

SOURCE: 2oo0 chevy blazer cel and code p0171 and p0174

Depending on the engine it will have between 4 and 2.

If you had a straight 4 or 6 engine then there would be only 2, one on the exhaust manifold or exhaust pipe and then one just after the catalytic converter.

If you have a "V" engine (V8, V6) then you have an oxygen sensor on each exhaust manifold and will have a catalytic converter for each bank of the V. There will also be an oxygen sensor downstream of each converter as well. In this case there would be 4 oxygen sensors.

Posted on Oct 05, 2009

ste sie

  • 38 Answers

SOURCE: I have a 1999 chevy blazer with a 4.3l I took the

sounds like you know what you are doing, sometimes the codes have to be removed after repair, i'm not sure whether or not your vehicle requires this. If it is just a light bothering you try and clear the code and see if it comes back. Some Advance Auto or O'reilly has a tool to do this free of charge

Posted on Oct 13, 2009

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