The PACCAR MX P113A page of the 2013 PACCAR MX Diagnostic Service Manual is the manufacturer reference for diagnostic trouble code P113A, described in the manual as “Lambda sensor temperature – Unable to reach target temperature”. It is a 5-page PDF section covering lambda sensor diagnostics on EPA2013 PACCAR MX engines, and it keeps the same layout as every other code page in that manual.
Document details and coverage
| Brand | PACCAR |
| Model coverage | PACCAR MX engines, EPA2013 emissions |
| System group | DTCs / MX Engines (EPA2013) |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual |
| Fault code | P113A |
| Subject | Lambda sensor |
| Pages | 5 |
| File size | 0.5 MB |
| Format | |
| Language | English |
What PACCAR MX P113A means
The manual files P113A as a 1 trip MIL code with 3 drive cycle recovery, readiness group EGS heater and freeze frame type Exhaust gas. The diagnostic runs when the lambda sensor (F834) is in operating mode. The code sets when the PCI ECU (D420) detects that the lambda sensor temperature is not within the expected values within 25 seconds, or exceeds a safe maximum value, and it changes to inactive when the fault is no longer detected.
Possible causes and technical data
- Faulty lambda sensor
Technical data covers the component check on lambda sensor (F834) with connector F834 disconnected, a heater element resistance of 2.4-4.0 Ω at 20°C [68°F], and a component and circuit check on the PCI ECU (D420) side of the harness. The page then runs 4 numbered troubleshooting steps, each with its own step ID, starting from a visual inspection of connectors and harness with the ignition off. The manual warns against back probing, notes that disconnecting the EAS connectors during troubleshooting produces multiple errors, and reminds the technician to exit the fault code menu in DAVIE and rerun the test before judging whether anything changed.
Who needs this PACCAR MX P113A manual page
Heavy-duty technicians, fleet shops and independent workshops diagnosing Kenworth and Peterbilt trucks with EPA2013 PACCAR MX engines use this page to confirm what the ECU actually measured before parts are ordered. For engine literature, dealer locations and support contacts beyond this single code, start at the PACCAR corporate website.
The complete PACCAR MX P113A extract from the 2013 PACCAR MX Diagnostic Service Manual is filed in the DiagTechPro manuals library, where the 5-page PDF can be viewed or downloaded with a free account.
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