01 RX300 Check Engine, VSC, fumes, engine hesitation
11-03-10, 07:47 AM
#1
Driver School Candidate
Thread Starter
01 RX300 Check Engine, VSC, fumes, engine hesitation
Please help! Re: 2001 Lexus RX300 AWD 117,000mi (frequent oil changes, trans fluid healthy)
About a month ago my check engine light and VSC light came on (intermittently), so I just kept driving it. Finally 2 weeks ago, the code lights stayed on. The symptoms I noticed were hesitating/jumpy engine in low gears. Idle was rough. Decrease in mpgs.
In the last week, I noticed fumes (smelled like normal gas). I saw an abnormal amount of exhaust when idling. I also could smell it, quite a bit, inside the car (all windows were closed).
Got codes read at Autozone:
1. P0171 (O2 sensor upstream)
2. P0174 (O2 sensor downstream)
3. P1130 (A/F)
4. P1150 (A/F)
Next day, car wouldn't turnover. It would start, but no turnover.
Towed to the mechanic. He said it was very flooded. He thought it was badly in need of a tune up. He changed 6 spark plugs, air filter, and oil change.
$500 later, it was running smoothly for a day. Both lights came back on. Reset yellow 20 fuse. Lights still on. SYMPTOMS CAME BACK (jumpy, fumes). (The idle remains smooth, for now, though.)
My b/f does most all of his own auto work, and I would like him to take over on my auto work from here on out.
I just need a diagnosis, please. Any input is deeply appreciated.
About a month ago my check engine light and VSC light came on (intermittently), so I just kept driving it. Finally 2 weeks ago, the code lights stayed on. The symptoms I noticed were hesitating/jumpy engine in low gears. Idle was rough. Decrease in mpgs.
In the last week, I noticed fumes (smelled like normal gas). I saw an abnormal amount of exhaust when idling. I also could smell it, quite a bit, inside the car (all windows were closed).
Got codes read at Autozone:
1. P0171 (O2 sensor upstream)
2. P0174 (O2 sensor downstream)
3. P1130 (A/F)
4. P1150 (A/F)
Next day, car wouldn't turnover. It would start, but no turnover.
Towed to the mechanic. He said it was very flooded. He thought it was badly in need of a tune up. He changed 6 spark plugs, air filter, and oil change.
$500 later, it was running smoothly for a day. Both lights came back on. Reset yellow 20 fuse. Lights still on. SYMPTOMS CAME BACK (jumpy, fumes). (The idle remains smooth, for now, though.)
My b/f does most all of his own auto work, and I would like him to take over on my auto work from here on out.
I just need a diagnosis, please. Any input is deeply appreciated.
11-03-10, 09:00 AM
#2
Driver School Candidate
Since no one answered, you should change your air fuel sensors. Here's the DIY for your boyfriend to read. https://www.clublexus.com/forums/rx-...el-sensor.html
11-03-10, 12:06 PM
#5
Driver School Candidate
I would do the A/F sensors first. Tell your b/f to be careful not to strip the threads when removing the old sensors. Loosen alittle then tighten and repeat until they come out. Replace only with Denso sensors. Try ebay.
11-03-10, 03:13 PM
#6
Driver School Candidate
11-17-10, 12:48 PM
#7
Driver School Candidate
Thread Starter
Fixed
djchan, thanks! I forgot to update (to you and anyone else who might come across the same problem)...
You're solution, recommending I change my A/F 02 sensors, worked! Hallelujah.
I did buy all three, but my bf only changed the A/F ones (which were black). I reset my dash lights and all is in working condition and running smoothly.
Thanks for your help.
L
You're solution, recommending I change my A/F 02 sensors, worked! Hallelujah.
I did buy all three, but my bf only changed the A/F ones (which were black). I reset my dash lights and all is in working condition and running smoothly.
Thanks for your help.
L
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