P1491 on Honda

On Honda, the EGR valve does not lift enough; on Nissan, a fault in the EVAP vacuum cut valve bypass valve

Severity not verified — if the car runs badly, have it inspected

The sources read describe the Honda and Nissan meanings but give no driving-risk rating. Honda lists engine hesitation or surging as a possible effect.

Source: how we rate severity

This page covers only what differs on Honda. For what P1491 means, the ranked causes and the test order, see the P1491 guide.

What's different on Honda

Honda

  • 1995–2004 · Odyssey

    Supported by vehicle data

    Honda has EGR bulletins naming P1491: 090199 (1995-1996), warranty extension 00009 (1999-2003) and 012704 (2003-2004). Whether they are still current is not verified.

  • 2003–2004 · Pilot

    Supported by vehicle data

    Honda warranty extension 00009 and bulletin 012704 name P1491 on the 2003-2004 Pilot. Whether they are still current is not verified.

  • 1994–1996 · Accord

    Supported by vehicle data

    Honda 090199 covers troubleshooting P0401 and P1491 on the 1994-1996 Accord. Whether it is still current is not verified.

  • 090199Status unverified

    Troubleshooting EGR codes P0401 and P1491

    1994–1996accord, odyssey · issued · NHTSA 608022

    Information on troubleshooting the EGR diagnostic trouble codes. The NHTSA summary does not give the steps.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 00009Status unverified

    Warranty extension for EGR contamination (P0401, P1491)

    1999–2003odyssey, pilot · issued · NHTSA 10017431

    EGR valve contamination or port clogging may cause P0401, P1491 or hesitation and surge.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 012704Status unverified

    Request for visit, engine stumbling or surging

    2003–2004pilot, odyssey · issued · NHTSA 10005652

    Customer complaint of stumbling, shuddering, hesitation or surging, possibly with a check engine light and codes including P1491.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Sources and review

  1. Honda 090199: troubleshooting EGR codes P0401 and P1491 — American Honda / NHTSA ,
  2. Honda 00009: warranty extension, EGR valve contamination or port clogging may cause P0401, P1491 or hesitation — American Honda / NHTSA ,
  3. Honda 012704: request for visit, engine stumbling or surging, check engine light and codes — American Honda / NHTSA ,
  4. Honda service manual DTC troubleshooting: P1491 (12-3) EGR valve insufficient lift — American Honda (service manual page read via hondziarze.duckdns.org mirror)
Last reviewed
Written by
Saurabh K.
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