Question about 1997 Pontiac Firebird

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Oxygen sensor problem

No codes show up in memory, car running in idle for at least 10 minutes, reading states open loop, no change in any numbers pretaining to fuel system. what could be causing the problem? it doesnt show any problems, but the sensors dont seem to be working.

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  • cdanzl May 26, 2009

    well i just got the car from a friend (who knows little about cars), he said it doesnt get very good gas mileage (he also drove it like it should be driven); i havent had a chance to drive it all that much. in idle, the rpm's stay around a steady 700 or 900 something, i dont remember which, but the engine seems to sputter a bit. and like i said, nothing shows up in the code bank. actually... could someone help me - could someone find what some of the sensor readings are supposed to be for a 97 firebird base model (3.8L V6)



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Have you noticed any proformance issues? low numbers in the 02 indicate rich exaust, high is lean. If they are fixed or only change a small amount then you may have another condition causing it. Good Luck

Posted on May 26, 2009


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2010 dodge journey 3.5 liter stays in open loop mode all the time runs horrible

To go into closed loop the computer needs to see engine coolant at operating temperature and rapidly changing oxygen sensor signals. So check the O2 sensor readings. The sensors have a built in heater so they can start reading faster. If the heater isn't working, they'll be slow to read. Also, a stuck open thermostat can delay closed loop

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Engine code p0138

no year, no joy, all i know is 1996 to 2013
no model stated,,, ouch. wrangler?
this is federal usa spec code P0 are. that.
O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

Read more at:

the rear oxygen sensor (not front) is sending wrong data.
it reads too high.
this means, 1: the wires to it are cut, burnt, melted or corroded.
or the sensor is bad
i might mean the CAT is bad. (the FSM shows the trip limits.)
since no year, and no car model stated, i cant get exact.

high is 1v, we know that, but is the failure , for over 1v?
if yes, the sensor is blow to bits or not connected.

ill roll the dice (snake eyes) 1996 wrangler, 4.0L , A/T

O2 (B1 S2) Circuit Short to Voltage
Number of Trips to Set Code: 1
Trouble Code Conditions:
Engine started; engine runtime more than 4 minutes, system voltage over 10.5v, ECT Sensor more than 180?F, and the PCM detected the O2 signal was more than 1.50v for 3 seconds.
Possible Causes:
  • O2 signal tracking (wet/oily) in connector due to short from signal to power circuit
  • O2 signal circuit is open
  • O2 ground circuit is open
  • O2 is damaged or it has failed
  • PCM has failed (never,will it be ,here.....well protected , im sure.)

1.5 v is illegal reading from the 02
O2 means the natural state, of 2 Oxygen atoms. the come in pairs.

what I do is connect my scan tool and plot B1S2 02 sensor
if it reads wrong, i clean and check connections.
ifi it still reads wrong its kicked to the curb (a new one)

hand wired i can get them for $20
PNP from Bosch $50 (plug it in, and play)

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1 Answer

I have a 89 buick electra 98000 miles I failed emissions for high co at idle I put a obd1 tester on it it showed vehicle was not going into closed loop I replaced oxygen sensor it then went into closed...

to stay in close loop o2 sensor have to be hot
and the converter catalyst is the one who keep the heat......
converter is it factory or never been change.
with scanner obd1 you should see the voltage variation of o2 sensor. it should go from lean to rich . .500mv is the middle then under .500mv is lean and over it is rich.......with this information ecm correct the fuel delivery
hope it helps

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5.3 liter Chevy engine #1 Cylinder not firing at idle

My opinion...

Year? Miles?

There's no way I'd dive into a "HEAD GASKET"
diagnosis without pressure testing the cooling
system and (wet/dry) COMPRESSION testing
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Even if it is a "HEAD GASKET"... the entire engine
might be ready for a REFRESH... and tossing a new
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Come back with some compression numbers...

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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.
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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.
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