2003 Toyota Prado (GRJ120R) — Repair Solution

4.0L 1GR-FE 6cyl 24v DOHC VVT MPFI Petrol Auto · Misfire / Misfire Codes · Engine

Toyota Prado (GRJ120R) Misfire / Misfire Codes Engine Diagnostic Sequence Available

Vehicle Details

Make: Toyota
Model: Prado (GRJ120R)
Year: 2003
Engine: 4.0L 1GR-FE 6cyl 24v DOHC VVT MPFI Petrol Auto
Kilometres: 424,000
Area: Engine
Category: Misfire / Misfire Codes

Customer Complaint

The engine is running rough.

Problem Summary

The engine has a misfire when accelerating but seems to only happen when the engine is hot. Spark plugs and ignition coils were replaced recently by somebody else. Fuel injectors have been serviced recently by somebody else. Another workshop sent away the ECU for testing but no faults were found.

Diagnostic Sequence

The step-by-step diagnostic process used to identify this fault is available to TaT members.

Unlock with Free Trial

Fault Description

The detailed fault description and root cause analysis for this 2003 Toyota Prado (GRJ120R) is available to TaT members.

Unlock with Free Trial

Verified Repair Solution

The confirmed repair procedure for this 2003 Toyota Prado (GRJ120R) is available to TaT members. Includes the verified fix and technician tips.

Unlock with Free Trial

Quick Facts

CodeTOYGR03130
Vehicle2003 Toyota Prado (GRJ120R)
Engine4.0L 1GR-FE 6cyl 24v DOHC VVT MPFI Petrol Auto
ComplaintVisible
Diag. SequenceMembers Only
SolutionMembers Only

Need the Full Fix?

Get the complete diagnostic sequence, verified solution, and technician tips.

Access the Full Repair Solutions Database

Unlock 6,127 verified repair solutions with complete diagnostic details, confirmed fixes, and technician tips.


© 2026 The Automotive Technician (TaT) — www.tat.net.au