This document is the 2013 PACCAR MX Diagnostic Service Manual covering PACCAR MX P1133 lambda heater fault code, published by PACCAR for MX engine diagnostics. It provides a complete diagnostic reference for mechanics troubleshooting oxygen sensor heater circuit faults on EPA 2013 compliant engines. The manual includes wiring schematics, electrical test procedures, and step-by-step repair workflows.
Document details and specifications — PACCAR MX P1133
| Brand | PACCAR |
| Model coverage | MX Engines |
| System/Group | DTCs / MX Engines (EPA 2013) |
| Publication number | P1133 |
| Year/Revision | 2013 |
| Pages | 5 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Table of contents
- Fault code number and description (P1133)
- Fault code information (1 trip MIL, 3 drive cycle recovery)
- Description of components (lambda sensor, air/fuel ratio measurement, sensor heater operation)
- Sensor heating control (first stage and second stage heating)
- Effect on the system (air/fuel ratio determination, smoke limit control, NOx emissions, DPF regeneration)
- Location of components
- Diagnostic conditions and set conditions
- Electrical diagrams (connector D420 and F834 pinouts)
- Technical data (lambda sensor component check, ECU circuit check)
- Possible causes
- Diagnostic step-by-step troubleshooting procedure (5 steps)
- Verification drive cycle
Applies to these models
This manual applies to PACCAR MX diesel engines meeting EPA 2013 emissions standards. It covers diagnostics for the lambda sensor heater circuit on ECU D420 pin C46. The PACCAR MX P1133 lambda heater fault occurs when voltage is too high or when a short circuit to supply is detected. For official PACCAR engine support and technical resources, visit PACCAR official website.
Who needs this MX P1133 lambda heater manual
Diesel truck mechanics and workshop technicians diagnosing oxygen sensor heater faults on PACCAR MX engines need this manual. Fleet maintenance managers performing EPA 2013 emissions system repairs will find the electrical schematics, component pinouts, and verification procedures essential for efficient fault resolution.
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