1995 Lexus SC 300 AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Performance DTCS

ENGINE PERFORMANCE DTCS

OEM Code Description
12 RPM SIGNAL CIRCUIT
13 RPM SIGNAL CIRCUIT
14 IGNITION SIGNAL CIRCUIT
16 ECT CONTROL SIGNAL MALFUNCTION
21 MAIN O2 SENSOR CIRCUIT (SC300), CODE 21 (FRONT OXYGEN SENSOR), CODE 28 (REAR OXYGEN SENSOR)
22 ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT
24 INTAKE AIR TEMPERATURE SENSOR CIRCUIT
25 AIR/FUEL RATIO MALFUNCTION (LEAN)
26 AIR/FUEL RATIO MALFUNCTION (RICH)
27 SUB-OXYGEN SENSOR CIRCUIT (CALIF.)
28 MAIN O2 SENSOR CIRCUIT (SC300), CODE 21 (FRONT OXYGEN SENSOR), CODE 28 (REAR OXYGEN SENSOR)
31 LOW AIRFLOW METER VOLTAGE
35 BAROMETRIC PRESSURE SENSOR CIRCUIT
41 TPS SIGNAL
42 VEHICLE SPEED SENSOR (VSS) SIGNAL CIRCUIT
43 STARTER SIGNAL
47 SUB-TPS SIGNAL
51 SWITCH CONDITION SIGNAL
52 KNOCK SENSOR CIRCUIT
53 KNOCK SENSOR CIRCUIT
55 KNOCK SENSOR CIRCUIT
71 EGR SYSTEM MALFUNCTION
78 FUEL PUMP CONTROL CIRCUIT
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.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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 Quote

No obligation. See pricing before you book.