Engine-Codes - Honda - P1491 1996 HONDA CIVIC

P1491 1996 HONDA CIVIC - Exhaust Gas Recirculation Valve Insufficient Lift

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1491 1996 HONDA CIVIC Possible Causes

  • Faulty Exhaust Gas Recirculation (EGR) Valve
  • Exhaust Gas Recirculation Valve harness is open or shorted
  • Exhaust Gas Recirculation Valve circuit poor electrical connection
  • Exhaust Gas Recirculation Valve clogged
  • Exhaust gas leaks

How is the P1491 1996 HONDA CIVIC code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

The EGR system may become contaminated or clogged, you can try to clean the EGR port.

What is the cost to diagnose the P1491 1996 HONDA CIVIC code

Labor: 1.0

The cost to diagnose the P1491 1996 HONDA CIVIC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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When is the code detected?

Low EGR flow control is detected

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible engine hesitation

P1491 1996 HONDA CIVIC Meaning

The Exhaust Gas Recirculation (EGR) system reduces Oxides of Nitrogen (NOx). NOx is generated by high combustion temperatures.
The EGR system lowers peak combustion temperature by recirculating inactive exhaust gas into the air/fuel mixture, thus reducing NOx emissions.
The EGR valve position sensor is built into the EGR valve and detects the amount of valve lift. The command value for the target valve lift is previously stored in the Powertrain Control Module (PCM) so that exhaust gas recirculation can be optimized according to driving conditions.
Comparing this command value with the EGR valve position sensor output signal value, the PCM controls the EGR valve to make the amount of actual valve lift equal to the command value.
If the EGR valve position sensor output signal value differs greatly from the command value in the PCM memory for a set period of time, the EGR valve or the EGR valve position sensor is considered faulty and a DTC is stored.

More Information

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