P1491 on Nissan
On Honda, the EGR valve does not lift enough; on Nissan, a fault in the EVAP vacuum cut valve bypass valve
Severity: 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.
This page covers only what differs on Nissan. For what P1491 means, the ranked causes and the test order, see the P1491 guide.
What's different on Nissan
NissanYour car
2001–2002 · Frontier
Supported by vehicle dataNissan NTB01039 and NTB02017A cover a MIL with P1491 on the Frontier. Whether they are still current is not verified.
2001–2002 · Xterra
Supported by vehicle dataNissan NTB01039 and NTB02017A cover the Xterra as well. Whether they are still current is not verified.
NTB01039Status unverified
MIL on with P1491 and/or difficulty refuelling
2001frontier, xterra · issued · NHTSA 625200
The summary links the code to a refuelling problem and does not give the repair.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
NTB02017AStatus unverified
MIL on with P1491 on some vehicles
2002frontier, xterra · issued · NHTSA 635792
The summary does not give the repair.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Sources and review
- Nissan NTB01039: MIL on with P1491 and/or difficulty refuelling
- Nissan NTB02017A: MIL on with P1491 set on some vehicles
- Honda 00009: warranty extension, EGR valve contamination or port clogging may cause P0401, P1491 or hesitation
- Honda service manual DTC troubleshooting: P1491 (12-3) EGR valve insufficient lift
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error