Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1996 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Engine Performance DTCS
ENGINE PERFORMANCE DTCS
| DTC | Description |
|---|---|
| P0100 | MASS AIRFLOW (MAF) SENSOR CIRCUIT |
| P0101 | MASS AIRFLOW (MAF) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM |
| P0110 | INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT |
| P0115 | ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT |
| P0116 | ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM |
| P0120 | THROTTLE POSITION (TP) SENSOR CIRCUIT MALFUNCTION |
| P0121 | THROTTLE POSITION (TP) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM |
| P0125 | INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL |
| P0130 | HEATED OXYGEN SENSOR FAULT (BANK NO. 1, SENSOR NO. 1) |
| P0133 | HEATED OXYGEN SENSOR (BANK NO. 1, SENSOR NO. 1) CIRCUIT SLOW RESPONSE |
| P0135 | HEATED OXYGEN SENSOR CIRCUIT (BANK NO. 1, SENSOR NO. 1) |
| P0136 | HEATED OXYGEN SENSOR CIRCUIT (BANK NO. 1, SENSOR NO. 2) |
| P0141 | HEATED OXYGEN SENSOR CIRCUIT (BANK NO. 1, SENSOR NO. 2) |
| P0141 | HEATED OXYGEN SENSOR CIRCUIT (BANK NO. 1, SENSOR NO. 2) |
| P0150 | HEATED OXYGEN SENSOR FAULT (BANK NO. 2, SENSOR NO. 1) |
| P0150 | HEATED OXYGEN SENSOR FAULT (BANK NO. 2, SENSOR NO. 1) |
| P0153 | HEATED OXYGEN SENSOR (BANK NO. 2, SENSOR NO. 1) CIRCUIT SLOW RESPONSE |
| P0153 | HEATED OXYGEN SENSOR (BANK NO. 2, SENSOR NO. 1) CIRCUIT SLOW RESPONSE |
| P0155 | HEATED OXYGEN SENSOR CIRCUIT (BANK NO. 2, SENSOR NO. 1) |
| P0155 | HEATED OXYGEN SENSOR CIRCUIT (BANK NO. 2, SENSOR NO. 1) |
| P0156 | HEATED OXYGEN SENSOR CIRCUIT (BANK NO. 2, SENSOR NO. 2) |
| P0156 | HEATED OXYGEN SENSOR CIRCUIT (BANK NO. 2, SENSOR NO. 2) |
| P0161 | HEATED OXYGEN SENSOR CIRCUIT (BANK NO. 2, SENSOR NO. 2) |
| P0161 | HEATED OXYGEN SENSOR CIRCUIT (BANK NO. 2, SENSOR NO. 2) |
| P0171 | SYSTEM TOO LEAN (FUEL TRIM) |
| P0172 | SYSTEM TOO RICH (FUEL TRIM) |
| P0300 | RANDOM MISFIRE DETECTED |
| P0301 | CYLINDERS NO. 1 MISFIRE DETECTED |
| P0302 | CYLINDERS NO. 2 MISFIRE DETECTED |
| P0303 | CYLINDERS NO. 3 MISFIRE DETECTED |
| P0304 | CYLINDERS NO. 4 MISFIRE DETECTED |
| P0305 | CYLINDERS NO. 5 MISFIRE DETECTED |
| P0306 | CYLINDERS NO. 6 MISFIRE DETECTED |
| P0307 | CYLINDERS NO. 7 MISFIRE DETECTED |
| P0308 | CYLINDERS NO. 8 MISFIRE DETECTED |
| P0325 | KNOCK SENSOR NO. 1 CIRCUIT |
| P0330 | KNOCK SENSOR NO. 2 CIRCUIT |
| P0335 | CRANKSHAFT POSITION (CKP) SENSOR CIRCUIT |
| P0340 | CAMSHAFT POSITION (CMP) SENSOR CIRCUIT |
| P0401 | INSUFFICIENT EXHAUST GAS RECIRCULATION (EGR) FLOW DETECTED |
| P0402 | EXCESSIVE EGR FLOW DETECTED |
| P0403 | EGR CIRCUIT MALFUNCTION |
| P0420 | CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD |
| P0430 | CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD |
| P0441 | INCORRECT EVAP PURGE FLOW |
| P0500 | VEHICLE SPEED SENSOR (VSS) MALFUNCTION |
| P0505 | IDLE CONTROL SYSTEM MALFUNCTION |
| P0510 | CLOSED THROTTLE POSITION (CTP) SWITCH MALFUNCTION |
| P1200 | FUEL PUMP RELAY CIRCUIT MALFUNCTION |
| P1300 | IGNITOR CIRCUIT MALFUNCTION |
| P1305 | IGNITOR CIRCUIT MALFUNCTION |
| P1335 | CRANKSHAFT POSITION (CKP) SENSOR CIRCUIT |
| P1335 | CRANKSHAFT POSITION (CKP) SENSOR CIRCUIT |
| P1400 | SUB-THROTTLE POSITION (SUB-TP) SENSOR MALFUNCTION |
| P1401 | SUB-THROTTLE POSITION (SUB-TP) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM |
| P1500 | STARTER SIGNAL CIRCUIT MALFUNCTION |
| P1600 | ECM BATT MALFUNCTION |
| P1605 | KNOCK CONTROL ECM MALFUNCTION |
| P1780 | PARK/NEUTRAL POSITION SWITCH MALFUNCTION |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.