O2 sensor question for RX300 Lex-heads
#1
Driver School Candidate
Thread Starter
O2 sensor question for RX300 Lex-heads
hey folks, based on some engine code feedback, i have changed my mass air flow sensor, & my idle air control valve, and have also removed & cleaned the O2 sensor on the front exhaust manifold. based on the remaining code, i still have a faulty O2 sensor (bank 1, the back/firewall side manifold) & the symptom i am trying to resolve is rough idle
i had cleaned IACV last year & that work for about a year. cleaned it again this week & rough idle returned, same again after actually *replacing* IACV yesterday - so my question is: Can a faulty O2 sensor cause the same symptom, i.e.: rough idle?
vacuum all seems to be ok, just trying to chase off this intermittent rough idle based on the codes - can anyone answer my question authoritatively re: O2 sensor's ability to cause rough idle (presumedly bad info going into the computer = bad info coming out?)
thx for any help or feedback. this is a 2000 yr model two/front wheel drive RX300
i had cleaned IACV last year & that work for about a year. cleaned it again this week & rough idle returned, same again after actually *replacing* IACV yesterday - so my question is: Can a faulty O2 sensor cause the same symptom, i.e.: rough idle?
vacuum all seems to be ok, just trying to chase off this intermittent rough idle based on the codes - can anyone answer my question authoritatively re: O2 sensor's ability to cause rough idle (presumedly bad info going into the computer = bad info coming out?)
thx for any help or feedback. this is a 2000 yr model two/front wheel drive RX300
#4
A faulty A/F sensor can make the car run poorly. Usually you will trip a CEL and the computer will kick into limp mode. Once in limp mode the computer puts everything in safe mode to try to keep the car from destroying itself. It usually runs pig rich and idles like crap. You will see your gas mileage cut in half and it will puke fuel/soot out the tail pipe.
Are you getting a CEL right now?
Are you getting a CEL right now?
#5
Lexus Champion
hey folks, based on some engine code feedback, i have changed my mass air flow sensor, & my idle air control valve, and have also removed & cleaned the O2 sensor on the front exhaust manifold. based on the remaining code, i still have a faulty O2 sensor (bank 1, the back/firewall side manifold) & the symptom i am trying to resolve is rough idle
i had cleaned IACV last year & that work for about a year. cleaned it again this week & rough idle returned, same again after actually *replacing* IACV yesterday - so my question is: Can a faulty O2 sensor cause the same symptom, i.e.: rough idle?
vacuum all seems to be ok, just trying to chase off this intermittent rough idle based on the codes - can anyone answer my question authoritatively re: O2 sensor's ability to cause rough idle (presumedly bad info going into the computer = bad info coming out?)
thx for any help or feedback. this is a 2000 yr model two/front wheel drive RX300
i had cleaned IACV last year & that work for about a year. cleaned it again this week & rough idle returned, same again after actually *replacing* IACV yesterday - so my question is: Can a faulty O2 sensor cause the same symptom, i.e.: rough idle?
vacuum all seems to be ok, just trying to chase off this intermittent rough idle based on the codes - can anyone answer my question authoritatively re: O2 sensor's ability to cause rough idle (presumedly bad info going into the computer = bad info coming out?)
thx for any help or feedback. this is a 2000 yr model two/front wheel drive RX300
#6
Driver School Candidate
Thread Starter
Thx guys but really my question is not re: the mass air flow sensor; rather, it's whether the bank 1 O2 sensor, which is the one on the back exhaust manifold, can cause rough idle? I don't have the code in front of me but it is specifically this O2 sensor. So, does anyone know if a faulty O2 sensor can cause rough idle the same way a faulty idle control valve can?
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#8
Driver School Candidate
Thread Starter
Right, but #4 refers to "A/F sensor" which I assume means air flow sensor, as in mass air flow sensor. I assume CEL means the ck engine light indicator. Again, the ? is about the bank 1 O2 sensor, so unless we r speaking the same language in different terms...
is there any chance "A/F sensor" means "air/fuel sensor", which = O2 sensor?
is there any chance "A/F sensor" means "air/fuel sensor", which = O2 sensor?
Last edited by austex300; 06-23-13 at 08:29 PM.
#10
Driver School Candidate
Thread Starter
Thx for followup carguy, will likely pursue that option. Would welcome anyone else who comes across this post and would like to add their feedback based on related experience
#11
Lexus Champion
You do know that there are THREE (3) trouble codes for each Air Fuel Ratio Sensor don't you? I had the feeling from your original post that maybe you weren't quite up to speed on understanding exactly what you were dealing with in the trouble code department. I have done mechanical work all my life and have had experience with RX A/F ratio sensors, IACV's and mass air flow sensors. Not ALL of the DTC's concerning those 3 things cause rough idle.
#13
Driver School Candidate
Thread Starter
i had the codes but tossed them. mechanic had them, there were 2 remaining, both related to O2 sensor (running way rich). replaced upstream O2 sensor (bank 1 sensor 1), cleared codes & the 2 did not return. all seems well now & i think i have finally chased away these air/fuel mixture gremlins. thx to all who posted feedback
#14
Driver School Candidate
i had the codes but tossed them. mechanic had them, there were 2 remaining, both related to O2 sensor (running way rich). replaced upstream O2 sensor (bank 1 sensor 1), cleared codes & the 2 did not return. all seems well now & i think i have finally chased away these air/fuel mixture gremlins. thx to all who posted feedback
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