Check Engine Light???

[Biaggi]

Ok, Does anyone know how to diagnose the problem with the Check Engine light? From the owners manual, it states that if the Cehck Engine light comes on it (1) is out of gas or (2) there is an electrical issue. Since I have a full tank, I suspect #2. My LX has 100,600 miles on it and I just recently changed the oil. After about 20 minutes of driving, the check engine light came on. Any help?

Thanks in advance,

[Biaggi]

Ok Guys... Thanks for the no response... I'd figure there would be a Lexus Tech lurking around, but I'll try to disclose all knowledge I have....

My wife took the LX to the dealer and they stated that this is a common problem with the LX450's. That the catalytic converter registers false readings when in frigid temperatures. He checked the codes and also the cat and verified that all is fine. So he just reset the codes. SOOOO if you have a check engine light come on, it could be the 2 reasons stated in the previous post or a false reading on the cats in cold temps (below 30 degrees ambient) I haven't seen any Service Bulletins or Recalls about this but I believe the service tech at Johnson's Lexus in Raleigh.

C'mon guys... lets make this forum help us!!! Try to post something useful when you find things out!

Thanks,

[ttobin]

i had this happen to me this morning, i appreciate your post.

i was looking on the UK posts and it appears that it could be something to do with the fuel cap. i think i will try to reset mine by pulling the fuse.

cheers

[gslx4s]

Ok Guys... Thanks for the no response... I'd figure there would be a Lexus Tech lurking around, but I'll try to disclose all knowledge I have....

My wife took the LX to the dealer and they stated that this is a common problem with the LX450's. That the catalytic converter registers false readings when in frigid temperatures. He checked the codes and also the cat and verified that all is fine. So he just reset the codes. SOOOO if you have a check engine light come on, it could be the 2 reasons stated in the previous post or a false reading on the cats in cold temps (below 30 degrees ambient) I haven't seen any Service Bulletins or Recalls about this but I believe the service tech at Johnson's Lexus in Raleigh.

C'mon guys... lets make this forum help us!!! Try to post something useful when you find things out!

Thanks,

i saw your post a bit late. I confirmed with toyota corp. that this is a normal thing with the normal thing in colder area's on the 450's. I also found out that you may be able to resolve this with a new cat. Not sure on the price. You may want to contact Lexus to replace if it becomes an issue.

[Drumboy]

Hey I just found your post.

I have a 94 GS300 and my check engine came on right after I bought the car from a small independent car lot. It turned out to be an EGR hose which the Lexus dealer fixed for a small fee. This was after I spent weeks trying to get an independent mechanic to fix it. Sometimes the dealer is the way to go.

Good luck!

[JPI]

What is the code? I never run into this problem before. I don't see why the CEL come in when there isn't a problem. They might just want to get you out the door. Get me the code and I will an answer for you.

JPI

[dougjohn]

You can get a check engine light for any number of reasons. Anything from a bad O2 sensor to an EGR valve. One of the more common reasons is that the gas cap is not on tight enough.

As for false readings from the catalytic converters...I've never heard of that one.

Regards,

Doug

[tem]

This is a list of the codes produced by OBDII

All of which will cause the Check engine light to stay on.

P0100

MAF Malfunction

P0101

MAF Circuit Range/Performance

P0110

IAT Circuit Malfunction

P0115

ECT Circuit Malfunction

P0116

ECT Circuit Range/Performance

P0120

TP Position Sensor/Switch ‘‘A’’ Circuit Malfunction

P0121

TP Position Sensor/Switch ‘‘A’’ Circuit Range/Performance

P0125

Insufficient Coolant Temperature For Closed Loop Fuel Control

P0130

HO2S Circuit Malfunction, Bank 1 Sensor 1

P0133

HO2S Circuit Slow Response, Bank 1 Sensor 1

P0135

HO2S Heater Circuit Malfunction, Bank 1 Sensor 1

P0136

HO2S Circuit Malfunction, Bank 1 Sensor 2

P0141

HO2S Heater Circuit Malfunction, Bank 1 Sensor 2

P0150

HO2S Circuit Malfunction, Bank 2 Sensor 1

P0153

HO2S Circuit Slow Response, Bank 2 Sensor 1

P0155

HO2S Heater Circuit Malfunction, Bank 2 Sensor 1

P0156

HO2S Sensor Circuit Malfunction, Bank 2 Sensor 2

P0161

HO2S Heater Circuit Malfunction, Bank 2 Sensor 2

P0170

Fuel Trim Malfunction

P0171

System Too Lean (Fuel Trim)

P0172

System Too Rich (Fuel Trim)

P0174

System Too Lean (A/F Lean Malfunction, Bank 2)

P0175

System Too Rich (A/F Rich Malfunction, Bank 2)

P0300

Random Misfire Detected

P0301

Misfire Detected, Cylinder 1

P0302

Misfire Detected, Cylinder 2

P0303

Misfire Detected, Cylinder 3

P0304

Misfire Detected, Cylinder 4

P0305

Misfire Detected, Cylinder 5

P0306

Misfire Detected, Cylinder 6

P0307

Misfire Detected, Cylinder 7

P0308

Misfire Detected, Cylinder 8

P0325

KS 1 Circuit Malfunction

P0330

KS 2 Circuit Malfunction

P0335

CKP Sensor ‘‘A’’ Circuit Malfunction

P0340

CMP Circuit Malfunction

P0385

CKP Sensor ‘‘B’’ Circuit Malfunction

P0401

EGR Insufficient Flow

P0402

EGR Excessive Flow

P0403

EGR Circuit Malfunction

P0420

Catalyst System Efficiency Below Threshold Bank 1

P0430

Catalyst System Efficiency Below Threshold Bank 2

P0440

EVAP Emission Control System Malfunction

P0441

EVAP Emission Control System Improper Purge Flow

P0446

EVAP Emission Control System Vent Control Malfunction

P0450

EVAP Emission Control System Pressure Switch Malfunction

P0451

EVAP Control System Pressure Sensor Range/Performance

P0500

VSS Malfunction

P0505

Idle Control System Malfunction

P0510

Closed TP Switch Malfunction

P0550

Power Steering Pressure Sensor Circuit Malfunction

P1100

BARO Sensor Circuit Malfunction

P1120

Accelerator Pedal Position Sensor Circuit Malfunction

P1121

Accelerator Pedal Position Sensor Range/Performance Problem

P1125

Throttle Control Motor Circuit Malfunction

P1126

Magnetic Clutch Circuit Malfunction

P1127

ECTS Actuator Power Source Circuit Malfunction

P1128

Throttle Control Motor Lock Malfunction

P1129

Electronic Throttle Control System

P1130

Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction (Bank 1 Sensor 1)

P1133

Air/Fuel Ratio Sensor Circuit Response Malfunction (Bank 1 Sensor 1)

P1135

Air/Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

P1150

Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction (Bank 2 Sensor 1)

P1153

Air/Fuel Ratio Sensor Circuit Response Malfunction (Bank 2 Sensor 1)

P1155

Air/Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

P1200

Fuel Pump Relay/ECU Circuit Malfunction

P1300

Igniter Circuit Malfunction (Bank 1 Or No. 1)

P1305

Igniter Circuit Malfunction, (Bank 2 Or No. 2)

P1310

Igniter Circuit Malfunction (No. 3)

P1315

Igniter Circuit Malfunction (No. 4)

P1320

Igniter Circuit Malfunction (No. 5)

P1325

Igniter Circuit Malfunction (No. 6)

P1330

Igniter Circuit Malfunction (No. 7)

P1335

CKP Sensor Circuit Malfunction During Engine Running

P1340

Igniter Circuit Malfunction (No. 8)

P1345

VVT Sensor Circuit Malfunction (Bank 1)

P1346

VVT Sensor Rang/Performance Problem (Bank 1)

P1349

VVT System Malfunction (Bank 1)

P1350

VVT Sensor Circuit Malfunction (Bank 2)

P1351

VVT Sensor Range/Performance Problem (Bank 2)

P1354

VVT System Malfunction (Bank 2)

P1400

Sub-TP Sensor Malfunction

P1401

Sub-TP Sensor Range/Performance

P1410

EGR Valve Position Sensor Circuit Malfunction

P1411

EGR Valve Position Sensor Circuit Range/Performance Malfunction

P1500

Starter Signal Circuit Malfunction

P1520

Stop Lamp Switch Malfunction

P1565

Cruise Control Main Switch Circuit Malfunction

P1566

Cruise Control Main Switch Circuit Malfunction

P1600

ECM BATT Malfunction

P1605

Knock Control CPU Malfunction

P1633

ECM Malfunction (ETCS Circuit)

P1645

Body ECU Malfunction

P1656

OCV Circuit Malfunction (Bank 1)

P1663

OCV Circuit Malfunction (Bank 2)

P1780

PNP Switch Malfunction

B2785

Ignition Switch On Malfunction (Immobilizer System)

B2786

Ignition Switch Off Malfunction (Immobilizer System)

B2785

Ignition Switch On Malfunction (Immobilizer System)

B2791

Key Unlock Warning Switch Malfunction (Immobilizer System)

B2795

Unmatch Key Code (Immobilizer System)

B2796

No Communication In Immobilizer System

B2797

Communication Malfunction No. 1 (Immobilizer System)

B2798

Communication Malfunction No. 2 (Immobilizer System)

Let me know if you want to read these codes without a reader.

Tom

[Thi]

Tom,

Are those codes generic or some belong to Lexus? How do you read the code without a scanner? Thanks.

Thi

[tem]

They were posted as Lexus 1996 & Newer OBDII codes, but apparently a few won't be used, Such as the Electronic Throttle control. The rest look good.

I am also wondering about the download command. I will look at the Data on the E1-T buss to see if it looks like the function is available.

[SKperformance]

i though obd 2 was for 97 and newer

but i know the 94 es 300 1mz-fe engine is also the worlds first obd 2 standard engine

i hope you don't mind as you have this already up i am going to paste it in the tutorial pages for all the codes

as my book has over 52 pages with 25 per page of codes

don't worry i will put them to you credit

[dougjohn]

In the Lexus LX world, '96 would've the first year for ODB 2. I think they became standard in Land Cruisers in '95.

...

Doug

[Joel40]

More than likely its your oxygen sensor saying your catalyst is bad. This is

because these go out about the 100,000 mile range. There are anywhere from 1 to 4 sensors costing about $100us each. Replace those even if you don't need too because they are about expired anyway and can cut your gas mileage down to half.

Regards

Ok, Does anyone know how to diagnose the problem with the Check Engine light?  From the owners manual, it states that if the Cehck Engine light comes on it (1) is out of gas  or (2) there is an electrical issue.  Since I have a full tank, I suspect #2.  My LX has 100,600 miles on it and I just recently changed the oil.  After about 20 minutes of driving, the check engine light came on.  Any help?

Thanks in advance,

←

[Tom_S]

Same thing happened to me. Drove off the lot at a dealer in a 96 lx450 with 109,000miles and the light went on.

When I went to see it, the car was TOTALLY out of gas. We drove directly to a gas station and put some in....but that was about 25 miles before the light went on....

Worried about the car now... it did seem to get really bad gas mileage on the way back...

HOW do you check for the code? Does it have to be at a toyota dealer? I assume you have to plug something in to read what it is....?

[health360]

Ok Guys... Thanks for the no response... I'd figure there would be a Lexus Tech lurking around, but I'll try to disclose all knowledge I have....

My wife took the LX to the dealer and they stated that this is a common problem with the LX450's. That the catalytic converter registers false readings when in frigid temperatures. He checked the codes and also the cat and verified that all is fine. So he just reset the codes. SOOOO if you have a check engine light come on, it could be the 2 reasons stated in the previous post or a false reading on the cats in cold temps (below 30 degrees ambient) I haven't seen any Service Bulletins or Recalls about this but I believe the service tech at Johnson's Lexus in Raleigh.

C'mon guys... lets make this forum help us!!! Try to post something useful when you find things out!

Thanks,

I have a 99 Lexus lx 470 and had check engine light come on once when I didn't tighten the gas cap all the way and second most recently but it not the gas cap. I had a diagnosis of bad O2 sensor which was replaced. The check engine light was off for about 3 days but has recently returned. I think that it is the cat. coverter, but it doesn't seem to be causing a problem at this point so I give.