Light has been on for about 2 years, Replaced both O2 sensors twice. Catalitic converter and Muffler twice. Most of the driving is highway driving. if prolonged city driving the light will go out for a while, how ever it appears that the gas milage goes down. I am at looking for solutions. my mechanic says that every thing checks out while idling in the shop and the codes indicate it is the O2 sensor or the catalitic converter. It appears that he want to keep replacing parts until we get the right one
Code P0132 is O2 sensor voltage high bank1 sensor 1, P0137 is O2 sensor voltage low bank 1 sensor 2, P1189 indicates a fuel control problem bank 1. It could be either the O2 sensors or a convertor. Could also be intake manifold gaskets. GM had a lot of problems with the lower intake gaskets leaking on the 3.1 and 3.4 engines that was linked to their Dexcool coolant. In fact they just lost a class action lawsuit about it. check with the dealer and see if the intake problem has been taken care of. Hope this helps.
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Well keep the hell away from the dealer. It is out of warranty. Look at a parts store or ebay, you can find a converter for less than 100 bucks, that age of car your whole system is most likely gone so you may want to entertain "cat back" purchase which is the converter, pipe, muffler, tail pipe. Call around to local muffler shops and ask them the labor costs, stay away from the chain stores. Order your parts and take it there when they all come in. Go with a system for the car, not a generic one. And you know some small muffler shop may well sell you all the parts for the same as you would pay for parts and shipping through ebay vendor. And there are O2 sensors front and rear of the converter, on a ten year old car I would replace those at the same time.
Downstream O2 sensor is after (downstream) the catalitic converter on the exhaust pipe. Upstream O2 sensor is after (downstream) the engine exhaust manifold - before (upstream) the catalitic converter. Upstream O2 sensor controls air-to-fuel ratio to yield a small excess oxygen. Downstream O2 sensor assesses the catalitic converter performance.
The catalitic converter is a mechanical device , it simply converts harmful emissions into water/vapour.
The 02 sensor if faulty would put the engine management light on. If the 02 sensor has been faulty for sometime it could tell the ECU to supply the wrong amount of fuel to the engine which in turn would eventually damage the catalitic convertor.
So you may have to change both in the end, but first I would check out the 02 sensor and replace if required.
To diagnos the catalytic converter, remove exhaust Y pipe from exhaust manifolds and start up. If engine runs goood and revs up, then suspect a restriction in your exhaust. Exhaust shop should be able to fix the problem. Cannot repair the cat converter. It is a honeycomb of metals inside that superheat the exhaust and burn off any unburnt fuel. When the honeycomb melts from contamination then it blocks exhaust air flow.
p1133 O2 sensor insufficent switching (pre converter, left bank)
p1153 ) 02 sensor insufficient switching preconverter right bank
P0420) catalyst system efficiency below threshold left bank
P0151) 02 sensor circuit high voltage pre converter right bank
and p1460 unfortunately I don't have handy..... But REALLY sounds like you need to replace the Oxygen sensors in front of the catalitic converters... There is dual exhaust coming from the engine to one muffler in that truck, there are a total of 2 converters and 4 O2 sensors (1 in front of converter and 1 behind it on both of the pipes) Front ones are definetely shot!!!! Be prepared to put the rear ones in shortly after!!!!! they are about $80 canadian each at the jobbers and probably more at the dealer!!!!!