94 es300 check engine light
07-31-11, 07:06 PM
#1
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94 es300 check engine light
I have a 1994 ES 300. The other day the check engine light came on. It runs fine but the light bugs me so today I went to Auto Zone and the kid there said he cannot pull the codes because it's not a 96 or newer.
How do I get the codes from the OBD.?
Thanks
Dave
How do I get the codes from the OBD.?
Thanks
Dave
07-31-11, 07:57 PM
#2
The 94 ES is OBDII. In most cars, 1996 was the first year for OBDII; however, Lexus was two model years early in adopting this.
Inside the under dash fuse panel, the plugin port for the code reader is just to the right of the rows of fuses.
Either tell the Auto Zone person that your car is a 96 model and show him the port, or go to Harbor Freight and get you an inexpensive code reader.
Inside the under dash fuse panel, the plugin port for the code reader is just to the right of the rows of fuses.
Either tell the Auto Zone person that your car is a 96 model and show him the port, or go to Harbor Freight and get you an inexpensive code reader.
08-02-11, 09:45 AM
#3
Driver School Candidate
Thread Starter
I took it back to them and they read the codes. Said it's the O2 sensors, front and back. I have 165,000 miles on the car and would bet they have never been changed. I hate to shell out that kind of cash but if I must, I must.
08-02-11, 10:24 AM
#4
The folks who did the code check should have told you which sensors were throwing codes.
The front sensors (bank 1, sensor 1 and bank 2, sensor 1) are fairly easy to change out. The bank 1, sensor 1 sensor is located in a tiny space between the engine and firewall and is somewhat difficult to access. The other front sensor is easily accessible. The rear sensor is more difficult. I have never had to change this one out, but I understand that you have to remove the driver's seat to access the wire connector for this sensor.
The front sensors (Denso part 2344632) are available at Rock Auto for $61.79 each. They are about $150.00 at Toyota and Lexus dealers. The rear sensor (Denso part 2344623) is $56.79 at Rock Auto. It is also about $150.00 at Toyota and Lexus dealers. According to the Denso website, the OEM sensors are made by Denso; therefore, there should be no difference between the parts (other than about $90.00 in cost). The Denso sensors I used fit perfectly into the wiring harness.
If you have a Harbor Freight store nearby, they sell oxygen sensor sockets for about $5.00. These sockets fit a 3/8" socket wrench.
If the sensors have never been changed, they might be hard to remove. Spray them with PB blaster and wait a while for it to soak in. Even with that, you may need a breaker bar to get them to break free.
08-04-11, 08:30 AM
#5
Driver School Candidate
Thread Starter
Do it yourself. Depending upon which sensors are involved, the job can be easy to somewhat difficult.
The folks who did the code check should have told you which sensors were throwing codes.
The front sensors (bank 1, sensor 1 and bank 2, sensor 1) are fairly easy to change out. The bank 1, sensor 1 sensor is located in a tiny space between the engine and firewall and is somewhat difficult to access. The other front sensor is easily accessible. The rear sensor is more difficult. I have never had to change this one out, but I understand that you have to remove the driver's seat to access the wire connector for this sensor.
The front sensors (Denso part 2344632) are available at Rock Auto for $61.79 each. They are about $150.00 at Toyota and Lexus dealers. The rear sensor (Denso part 2344623) is $56.79 at Rock Auto. It is also about $150.00 at Toyota and Lexus dealers. According to the Denso website, the OEM sensors are made by Denso; therefore, there should be no difference between the parts (other than about $90.00 in cost). The Denso sensors I used fit perfectly into the wiring harness.
If you have a Harbor Freight store nearby, they sell oxygen sensor sockets for about $5.00. These sockets fit a 3/8" socket wrench.
If the sensors have never been changed, they might be hard to remove. Spray them with PB blaster and wait a while for it to soak in. Even with that, you may need a breaker bar to get them to break free.
The folks who did the code check should have told you which sensors were throwing codes.
The front sensors (bank 1, sensor 1 and bank 2, sensor 1) are fairly easy to change out. The bank 1, sensor 1 sensor is located in a tiny space between the engine and firewall and is somewhat difficult to access. The other front sensor is easily accessible. The rear sensor is more difficult. I have never had to change this one out, but I understand that you have to remove the driver's seat to access the wire connector for this sensor.
The front sensors (Denso part 2344632) are available at Rock Auto for $61.79 each. They are about $150.00 at Toyota and Lexus dealers. The rear sensor (Denso part 2344623) is $56.79 at Rock Auto. It is also about $150.00 at Toyota and Lexus dealers. According to the Denso website, the OEM sensors are made by Denso; therefore, there should be no difference between the parts (other than about $90.00 in cost). The Denso sensors I used fit perfectly into the wiring harness.
If you have a Harbor Freight store nearby, they sell oxygen sensor sockets for about $5.00. These sockets fit a 3/8" socket wrench.
If the sensors have never been changed, they might be hard to remove. Spray them with PB blaster and wait a while for it to soak in. Even with that, you may need a breaker bar to get them to break free.
08-04-12, 08:19 AM
#6
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The 94 ES is OBDII. In most cars, 1996 was the first year for OBDII; however, Lexus was two model years early in adopting this.
Inside the under dash fuse panel, the plugin port for the code reader is just to the right of the rows of fuses.
Either tell the Auto Zone person that your car is a 96 model and show him the port, or go to Harbor Freight and get you an inexpensive code reader.
Inside the under dash fuse panel, the plugin port for the code reader is just to the right of the rows of fuses.
Either tell the Auto Zone person that your car is a 96 model and show him the port, or go to Harbor Freight and get you an inexpensive code reader.
Pic of the plug....
Last edited by sdanskin; 08-04-12 at 08:52 AM.
08-04-12, 09:21 AM
#7
I have a 94 lexus es 300 with the engine light on and I took it to autozone to have the codes checked but they could not hook up the diagnostic, the port is different. is there an adapter for this?
Pic of the plug....
Attachment 254719
Pic of the plug....
Attachment 254719
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08-04-12, 09:58 AM
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Yep found it thanks! Now to go back to autozone and stick his "only on 96 and up" nose in it!
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