Replace oxygen sensor even if check engine light does not come on
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From: Ray O on 23 Nov 2009 15:02 "msrdude" <kimiga(a)gmail.com> wrote in message news:1a09a78d-5841-4338-be7c-5c15429c0275(a)k13g2000prh.googlegroups.com... > Well I am kind of getting bad fuel economy on my car. I replaced the > air filter, spark plug, spark plug wires, poured in fuel injector and > fuel system cleaner into my gas tank after fill up. It sill made no > difference. So I suspect the o2 sensor is kind of bad causing the fuel > economy to be kind of bad. Well I never replaced the o2 sensor before > and its 125 k miles on it. Well I should replace it anyways because it > is almost due anyways. > Should I buy the NTK o2 sensors or should I go with OEM Toyota? What brand spark plug and spark plug wires did you use? When you say that the fuel economy is kind of bad, how bad is it? Toyota does not publish a replacement interval for O2 sensors because they normally do not need to be replaced unless they are bad. I would be surprised if a bad O2 sensor made more than a 1 MPG difference, if that. There are many other things that can cause poor fuel economy that I would check before replacing the O2 sensor. Check tire inflation. They should be filled to at least the pressure specified in your owner's manual, preferably 5 or 6 PSI higher to improve fuel economy and tire life. Multiple short trips will result in poor fuel economy because the engine gets poorer fuel economy while it is warming up. Does the coolant temperature gauge rise to the halfway point when the engine is warmed up? Excess weight in the car will reduce fuel economy so empty unnecessary cargo. Jackrabbit starts, unsteady throttle, etc. will reduce fuel economy. What is the condition of the transmission and automatic transmission fluid? If you decide to replace the O2 sensors use OEM. -- Ray O (correct punctuation to reply)
From: Ray O on 23 Nov 2009 15:04 "Mike Hunter" <Mikehunt2(a)lycos,com> wrote in message news:4b0ae82b$0$22066$ce5e7886(a)news-radius.ptd.net... > What you SHOULD do is take the car to a competent tech, who has the proper > equipment to analyze WHY the check engine light is illuminated and have > the fault corrected, or you can continue to change some very expensive > parts, like the O2 Sensor, until you hit upon the correct part that is > causing the check engine light to illuminate. > > The O2 Sensor rarely fails, but it does become contaminated, because of > what could be a minor fault in the closed loop system > Check the title of the post - the check engine light is not even illuminated. -- Ray O (correct punctuation to reply) > > "msrdude" <kimiga(a)gmail.com> wrote in message > news:1a09a78d-5841-4338-be7c-5c15429c0275(a)k13g2000prh.googlegroups.com... >> Well I am kind of getting bad fuel economy on my car. I replaced the >> air filter, spark plug, spark plug wires, poured in fuel injector and >> fuel system cleaner into my gas tank after fill up. It sill made no >> difference. So I suspect the o2 sensor is kind of bad causing the fuel >> economy to be kind of bad. Well I never replaced the o2 sensor before >> and its 125 k miles on it. Well I should replace it anyways because it >> is almost due anyways. >> Should I buy the NTK o2 sensors or should I go with OEM Toyota? >> > >
From: Jeff Strickland on 23 Nov 2009 16:00 "msrdude" <kimiga(a)gmail.com> wrote in message news:1a09a78d-5841-4338-be7c-5c15429c0275(a)k13g2000prh.googlegroups.com... > Well I am kind of getting bad fuel economy on my car. I replaced the > air filter, spark plug, spark plug wires, poured in fuel injector and > fuel system cleaner into my gas tank after fill up. It sill made no > difference. So I suspect the o2 sensor is kind of bad causing the fuel > economy to be kind of bad. Well I never replaced the o2 sensor before > and its 125 k miles on it. Well I should replace it anyways because it > is almost due anyways. > Should I buy the NTK o2 sensors or should I go with OEM Toyota? DO NOT BUY AN O2 SENSOR to correct the symptom you are trying to correct. The O2 Sensor will throw a code if it is so bad to affect the mileage so you would notice. If your region has Summer and Winter Blend fuels, the change of the blend will cause trouble with your mileage. Please define, "kind of bad."
From: Jeff Strickland on 23 Nov 2009 16:09 "Mike Hunter" <Mikehunt2(a)lycos,com> wrote in message news:4b0ae82b$0$22066$ce5e7886(a)news-radius.ptd.net... > What you SHOULD do is take the car to a competent tech, who has the proper > equipment to analyze WHY the check engine light is illuminated and have > the fault corrected, or you can continue to change some very expensive > parts, like the O2 Sensor, until you hit upon the correct part that is > causing the check engine light to illuminate. > > The O2 Sensor rarely fails, but it does become contaminated, because of > what could be a minor fault in the closed loop system Mike, The Check light is not on. The OP has reported poor fuel mileage, and wants advice on replacing the O2 Sensor to fix the problem.
From: Mike Hunter on 23 Nov 2009 20:00
He did not say if it was on not. "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote in message news:heeptq$vpc$1(a)news.eternal-september.org... > > "Mike Hunter" <Mikehunt2(a)lycos,com> wrote in message > news:4b0ae82b$0$22066$ce5e7886(a)news-radius.ptd.net... >> What you SHOULD do is take the car to a competent tech, who has the >> proper equipment to analyze WHY the check engine light is illuminated and >> have the fault corrected, or you can continue to change some very >> expensive parts, like the O2 Sensor, until you hit upon the correct part >> that is causing the check engine light to illuminate. >> >> The O2 Sensor rarely fails, but it does become contaminated, because of >> what could be a minor fault in the closed loop system >> > > Check the title of the post - the check engine light is not even > illuminated. > -- > > Ray O > (correct punctuation to reply) > >> >> "msrdude" <kimiga(a)gmail.com> wrote in message >> news:1a09a78d-5841-4338-be7c-5c15429c0275(a)k13g2000prh.googlegroups.com... >>> Well I am kind of getting bad fuel economy on my car. I replaced the >>> air filter, spark plug, spark plug wires, poured in fuel injector and >>> fuel system cleaner into my gas tank after fill up. It sill made no >>> difference. So I suspect the o2 sensor is kind of bad causing the fuel >>> economy to be kind of bad. Well I never replaced the o2 sensor before >>> and its 125 k miles on it. Well I should replace it anyways because it >>> is almost due anyways. >>> Should I buy the NTK o2 sensors or should I go with OEM Toyota? >>> >> >> > > |