Cel
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Driver School Candidate
Joined: Jul 2007
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From: Georgia
Cel
Have read a number of threads about the CEL coming on in RX 300s...from what I can tell, this seems a fairly common occurence once the vehicles get 40K+ miles on them. Diagnostics run from lean system to O2 sensors to MAFs etc. Here's my question...if one is working through the various possibilities for what is wrong when the CEL comes on, is any harm done if it takes a while to determine the cause, i.e., does it do any damage to continue driving the car with the CEL light on? I'm getting a CEL with diagnostic of "lean system" (bank 1 and bank 2)...not real sure as yet what's causing it but have a 1000+ mile trip I'm planning to take...it this risky? Am driving a 2000 RX with 78,000 mi on it.
CL Community Team
Joined: Apr 2004
Posts: 17,329
Likes: 210
From: Miami, Florida
Have read a number of threads about the CEL coming on in RX 300s...from what I can tell, this seems a fairly common occurence once the vehicles get 40K+ miles on them. Diagnostics run from lean system to O2 sensors to MAFs etc. Here's my question...if one is working through the various possibilities for what is wrong when the CEL comes on, is any harm done if it takes a while to determine the cause, i.e., does it do any damage to continue driving the car with the CEL light on? I'm getting a CEL with diagnostic of "lean system" (bank 1 and bank 2)...not real sure as yet what's causing it but have a 1000+ mile trip I'm planning to take...it this risky? Am driving a 2000 RX with 78,000 mi on it.
CL Community Team
Joined: Apr 2004
Posts: 17,329
Likes: 210
From: Miami, Florida
Here is the P0171 list again,
1. Air intake (usually a hose, i.e., the hose on the back of the airbox).
2. Fuel line pressure- fuel pump, fuel filter, fuel line injectors. 3. Injector blockage
4. A/F sensors
5. MAF sensor
6. Engine coolant temperature sensor
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The most common one has always been the MAF sensor and the little red diode and the wires inside the sensor getting dirty. Even if you reset the code, if you don't clean it, it will come back.
The A/F sensor is not an impossible culprit here, but usually other OBDII codes pop up.
I'd take a close look at the MAF.
I have driven with P0171 errors plenty of times, sometimes just as soon as I leave my home and go up to the track, reset the light at the trac and fly down the track several times, and no other issues.
1. Air intake (usually a hose, i.e., the hose on the back of the airbox).
2. Fuel line pressure- fuel pump, fuel filter, fuel line injectors. 3. Injector blockage
4. A/F sensors
5. MAF sensor
6. Engine coolant temperature sensor
----------------------------------------
The most common one has always been the MAF sensor and the little red diode and the wires inside the sensor getting dirty. Even if you reset the code, if you don't clean it, it will come back.
The A/F sensor is not an impossible culprit here, but usually other OBDII codes pop up.
I'd take a close look at the MAF.
I have driven with P0171 errors plenty of times, sometimes just as soon as I leave my home and go up to the track, reset the light at the trac and fly down the track several times, and no other issues.
CL Community Team
Joined: Apr 2004
Posts: 17,329
Likes: 210
From: Miami, Florida
Pull the negative battery cable or the EFI fuse in the fusebox. See the sticky thread at the top of the RX300 forum, https://www.clublexus.com/forums/sho...d.php?t=295546
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