Question about 1997 Chevrolet S-10 Pickup

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1997 Chevrolet s10 2.2L 4cyl. I run a dianostic computer on it said change exhaust sensor after cataletic converter an engine running lean! I changed it, after about 5 miles service engine soon light came back on,did the same now a code P1133,P0171,The 1133 heated oxygen sensor-Bank 1 sensor,0171 fuel trim bank one condition they say its the oxgen sensor before the catalitic converter! I don't want to replace all the sensors,it says one of the probable cause - failed HO2S11 (Bank 1 Sensor 1) heater circuit one say the rich to lean ratio condition on one bank only,the other Ecm has detected the switch ratio ratio of rich to leanwas below a determined number! (HELP) my cash is low !!!

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Engine is probably sucking air causing the lean condition

Posted on Aug 24, 2010

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I have 2002 chevy impala changed the 02 sensor and it is still reading the same 02 sensor.


because its not the sensor.
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is the cataletic converter/exhaust system
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replace the converter and youll be fine i still have my old sensors in there that gave me the code :)
there not saying there bad but that the cat is bad.

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I am getting 13 miles per gallon. what is wrong?


Your O2 sensor (or oxygen sensor) is located on your exhaust system. One placed before your coverter to measure the efficiency of the combustion in your engine by measuring the amount of oxygen left in the exhaust stream. The second O2 sensor is placed after the converter and its job is to measure the effiecency of the converter in filtering out harmful gases in the exhaust by compairing its reading to the sensor paced before the converter. If your O2 sensor has failed it will tell the car's computer that it is running too lean (more air than fuel) by default. Since the computer thinks the car is running lean, it now is adding more fuel to the mixture to try and compensate for the lean condition and will always have a check engine light on. If there is no check engine light on then it probably is not a faulty O2 sensor. Have a qualified technician run a fuel consumption test and go from there.

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What could the problem be for my 1996 ford escort 1600 zetec 16 valve its consuming too much petrol and it smells from the exhaust pipe and it smokes a little


Do you have any error codes to help in the diagnosis. Failing that, it sounds as if your car is not entering 'closed loop' properly. When an engine is warming up, in 'open loop' mode, the engine's computer calls on the injectors to inject more fuel to keep the engine running, to warm up the engine quickly and to have the catalytic converter to start working early. This is why the engine idles quickly at start up. The coolant sensor informs the computer about engine temperature. When the engine is in 'closed loop' the engine is at normal running temperature and the computer no longer looks to the coolant sensor but to the oxygen sensor on the exhaust to establish the correct fuel air ratio. If the oxygen sensor is not working the computer continues as if the engine is in still 'open loop' mode.
First check the MAF sensor next to the air cleaner box on the ducting. If dirty take it out and give it a spray with residue free electrical cleaner (do not use carb cleaner as it too harsh and leaves its own residue). Next check coolant levels, if coolant level low the coolant sensor may not be able to detect its temperature.
Next check the coolant sensor, its electrical resistance drops as it gets warmer, so check at cold and after 1 minute running and there should be quite a difference. If not the sensor is bad and needs changing.
Finally check the oxygen sensor. When lean (lots of oxygen in the exhaust) the output from the sensor is low voltage (about 0.1volt) and when rich the voltage is 1volt. If the oxygen sensor is says, in error, that the exhaust is lean (low or no voltage) the computer will respond by increasing the fuel injected to compensate.
Most fuel economy issues are due to the four areas above

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Something odd about what you posted. An engine that is running lean shouldn't be using a lot of fuel. Lean is when there isn't enough fuel going into the engine. Two other sensors that regulate fuel flow are the map sensor and throttle position sensor. Temp sensor generally would cause a rich condition but I'd test that too. Be sure to check for vacuum leaks at the manifold and lines as well as fittings... A vacuum leak will give the O2 sensor a lean reading...seeing that, the computer will try to compensate by adding fuel. Clearing codes can change the way it's running but as soon as the computer runs through it's internal diagnostics it will turn the light back on if there is a problem.

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This sounds like an O2 sensor, there are 4 O2 sensors, 2 for each bank, 2 up stream by the exhaust manifold and 2 down stream by the catalytic converter. However the information you have given is limited, the explanation for the code seems to be missing some information. Ex: right bank sensor 1 to lean.

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1 Answer

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