Help me with P0125
Thread Starter
Driver School Candidate
Joined: Apr 2011
Posts: 1
Likes: 1
From: NY
Help me with P0125
I have 2002 SC430 with 90K mile.
I brought it to one Autozone and they said it's coolant problem.
-> added coolant
I brought it to a Lexus dealer and they said b1s1 oxygen sensor needs to be replaced.
-> didn't believe
I brought it to a Meineke and they said thermostat needs to be replaced.
-> did, but the engine check sign came back on after 5 min driving.
I bought a OBD II reader and found the error code is P0125, and erased it. But it came back on after 5 min driving.
I bought b1s1 O2 sensor (BOSCH 13441) and had a local repair shop replace it.
-> drove 120 miles and deleted VSC & VSC off signs by zero calibration, but the engine check sign came back on
I brought it to an Advanced Auto Parts and they said the error code is P0125 and deleted it.
-> It came back on after 5 min driving.
I checked the temperature gauge before and after driving, but it seems normal.
Now what should I do?
Many thanks in advance.
I brought it to one Autozone and they said it's coolant problem.
-> added coolant
I brought it to a Lexus dealer and they said b1s1 oxygen sensor needs to be replaced.
-> didn't believe
I brought it to a Meineke and they said thermostat needs to be replaced.
-> did, but the engine check sign came back on after 5 min driving.
I bought a OBD II reader and found the error code is P0125, and erased it. But it came back on after 5 min driving.
I bought b1s1 O2 sensor (BOSCH 13441) and had a local repair shop replace it.
-> drove 120 miles and deleted VSC & VSC off signs by zero calibration, but the engine check sign came back on
I brought it to an Advanced Auto Parts and they said the error code is P0125 and deleted it.
-> It came back on after 5 min driving.
I checked the temperature gauge before and after driving, but it seems normal.
Now what should I do?
Many thanks in advance.
Last edited by zappacc; Apr 5, 2011 at 12:59 PM.
Pole Position
Joined: Dec 2009
Posts: 3,135
Likes: 276
From: CA - San Diego
P0125 error covers the following components: Have you cleaned your throttle body lately? Possible a too lean mixture. If the vehicle is short of fuel, the air-fuel ratio is LEAN and the P0125 will be recorded and MIL then come on.
Also check the PCV hose for looseness, or cracks or disconnections. We had a few of those issues lately. Also take a good hard look at your gas tank cap. Check the gasket damage or deformation. The fuel and emissions systems are pressurized if there's a leak it will throw a code.
Also check the PCV hose for looseness, or cracks or disconnections. We had a few of those issues lately. Also take a good hard look at your gas tank cap. Check the gasket damage or deformation. The fuel and emissions systems are pressurized if there's a leak it will throw a code.
Pit Crew
Joined: Apr 2009
Posts: 118
Likes: 10
From: FL
I have the same issue and code..P0125. I had P0135 and changed by b1s1 o2 sensor at the Toyota Dealership. I think they screwed something up, because the P0135 went away but now I have a P0125. From everything I've read, it's still the 02 sensor....either wiring or the sensor itself. I'm not sure if the toyota dealership did as good as a job as they should have.
Will probably go to the lexus dealer and see if they can fix this wrong.
Did you ever fix yours?
Will probably go to the lexus dealer and see if they can fix this wrong.
Did you ever fix yours?
Pole Position
Joined: May 2016
Posts: 3,053
Likes: 631
From: AZ
Take a look at this article https://www.autocodes.com/p0125_lexus.html
Based on what it says, I think it is your temperature sensor. Does you temperature gauge on your dashboard work?
A P0125 and a P0135 are two different things. Is it possible you have both codes stored in your car?
Do you still have the reader you bought? Can you go check for codes and tell us which ones are present?
Based on what it says, I think it is your temperature sensor. Does you temperature gauge on your dashboard work?
A P0125 and a P0135 are two different things. Is it possible you have both codes stored in your car?
Do you still have the reader you bought? Can you go check for codes and tell us which ones are present?
Pole Position
Joined: May 2016
Posts: 3,053
Likes: 631
From: AZ
Disregard my previous post. It turns out the P0125 could mean different things on different cars. Take a look at this Code list from Club Lexus
https://www.clublexus.com/forums/att...-dtc-chart.pdf
Since the dealer says it is the O2 sensor, I would go with them. I know a Denso sensor is about the same price or cheaper than a bosch sensor and the Denso is the Origional Equipment Maker. You may have to replace the bosch with the OEM. If you used the universal bosch with spliced in harness, than I would REALLY recommend you go with the Denso.
https://www.clublexus.com/forums/att...-dtc-chart.pdf
Since the dealer says it is the O2 sensor, I would go with them. I know a Denso sensor is about the same price or cheaper than a bosch sensor and the Denso is the Origional Equipment Maker. You may have to replace the bosch with the OEM. If you used the universal bosch with spliced in harness, than I would REALLY recommend you go with the Denso.
Trending Topics
ClubLexus Stories
Celebrating Lexus & Toyota from Around the Globe
Top 10 Lexus & Toyotas to Drive Before You Die!
Joe Kucinski
Top 10 Lexus/Toyotas With The LEAST 5-Year Depreciation
Joe Kucinski
Lexus LC500 Convertible Auction: A Preview of Rising Values?
Brett Foote
GX 550 vs TX 550: Best 3-Row Luxury Lexus Family Hauler
Michael S. Palmer
9 Best Lexus Models You Can Buy for Half Price (And 1 You Shouldn't!)
Joe Kucinski
2026 Lexus NX Buyer's Guide: Models, Features, Prices & More!
Brett Foote
Top 10 Reasons to Buy a Lexus TX 550h+ (& 3 Reasons to AVOID!)
Michael S. Palmer
Top 10 Lexus & Toyota Models of the 1990s RANKED!
Joe Kucinski
10 Great Toyotas That Could Have Been Lexus Models
Joe Kucinski
Pit Crew
Joined: Feb 2019
Posts: 204
Likes: 96
From: Scotland
Disregard my previous post. It turns out the P0125 could mean different things on different cars. Take a look at this Code list from Club Lexus
https://www.clublexus.com/forums/att...-dtc-chart.pdf
Since the dealer says it is the O2 sensor, I would go with them. I know a Denso sensor is about the same price or cheaper than a bosch sensor and the Denso is the Origional Equipment Maker. You may have to replace the bosch with the OEM. If you used the universal bosch with spliced in harness, than I would REALLY recommend you go with the Denso.
https://www.clublexus.com/forums/att...-dtc-chart.pdf
Since the dealer says it is the O2 sensor, I would go with them. I know a Denso sensor is about the same price or cheaper than a bosch sensor and the Denso is the Origional Equipment Maker. You may have to replace the bosch with the OEM. If you used the universal bosch with spliced in harness, than I would REALLY recommend you go with the Denso.
Pole Position
Joined: May 2016
Posts: 3,053
Likes: 631
From: AZ
O2 sensor probs are always tough because the sensors aren't cheap and you want to try all kinds of ways to get around the problem. Usually the solution does end up being changing the sensor. Still if you had recent exhaust work done, or your car is louder than it used to be, it might be something else. So feel free to let us know what your story is.
Thread
Thread Starter
Forum
Replies
Last Post
TonyAn
SC430 - 2nd Gen (2001-2010)
13
Aug 24, 2021 10:13 AM
