P0491 and PO492 - **SOLVED!**
#1
Three Wheelin'
Thread Starter
P0491 and PO492 - **SOLVED!**
I have a recurring CEL P0491 and PO492.
Any ideas?
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Any ideas?
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Last edited by roadsession; 09-10-2010 at 08:35 PM.
#2
Drifting
P0491 Secondary Air Injection System, Bank 1 - Insufficient Flow
P0492 Secondary Air Injection System, Bank 2 - Insufficient Flow
Possible cause of fault
- Electrical fault in power supply or line between relay and secondary air injection pump
- Secondary air injection pump relay mechanically faulty
- Mechanical fault in electrical secondary air valve
- Pneumatic secondary air valve faulty/sluggish
- Electrical fault in secondary air injection pump
- Mechanical fault in secondary air injection pump or secondary air injection pump blocked
- Vacuum system leaking
- Air hose to secondary air injection pump slipped off or constricted
P0492 Secondary Air Injection System, Bank 2 - Insufficient Flow
Possible cause of fault
- Electrical fault in power supply or line between relay and secondary air injection pump
- Secondary air injection pump relay mechanically faulty
- Mechanical fault in electrical secondary air valve
- Pneumatic secondary air valve faulty/sluggish
- Electrical fault in secondary air injection pump
- Mechanical fault in secondary air injection pump or secondary air injection pump blocked
- Vacuum system leaking
- Air hose to secondary air injection pump slipped off or constricted
#4
Three Wheelin'
Thread Starter
Went back to my dealer. It was a cracked vacuum tubing -diagnosed and replaced free of charge in 30 mins.
Benefits of a good relationship with the dealer...
Benefits of a good relationship with the dealer...
#5
Rennlist Member
I have a friend with these errors and misfiring with the engine running rough. Have diagnosed with Durametric. Did you experience misfires and rough running?
PS: he does not run his car now and the fault codes emerges straight after clearing them and running the engine.
#6
Three Wheelin'
Thread Starter
Hello roadsession
I have a friend with these errors and misfiring with the engine running rough. Have diagnosed with Durametric. Did you experience misfires and rough running?
PS: he does not run his car now and the fault codes emerges straight after clearing them and running the engine.
I have a friend with these errors and misfiring with the engine running rough. Have diagnosed with Durametric. Did you experience misfires and rough running?
PS: he does not run his car now and the fault codes emerges straight after clearing them and running the engine.
#7
Rennlist Member
Just got off the phone with my Indy. Similar problem (started a thread about it last week). And, I had a similar problem before and he found a cracked vacuum tube.
Good luck and can't wait for a resuloution for your problem.
TC
Good luck and can't wait for a resuloution for your problem.
TC
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#9
This may help https://rennlist.com/forums/996-foru...omponents.html
You can use a hand vacuum pump to track the vacuum leak and even verify the SAI valve's operation.
You can use a hand vacuum pump to track the vacuum leak and even verify the SAI valve's operation.
#10
Rennlist Member
As I mentioned in above post, we had these error codes and misfire codes as well. Were not able to check the vacuum system as our knowledge of this stops at "eeeeeehh that looks OK to me, or like a spaghetti monster".
So we moved over to changing all spark plugs and coils, success all around.
So we moved over to changing all spark plugs and coils, success all around.
#11
As I mentioned in above post, we had these error codes and misfire codes as well. Were not able to check the vacuum system as our knowledge of this stops at "eeeeeehh that looks OK to me, or like a spaghetti monster".
So we moved over to changing all spark plugs and coils, success all around.
So we moved over to changing all spark plugs and coils, success all around.
#12
Is this the same thing? doesn't seem to be since it says malfunction
P0491
Raw code: 0491
ECU: Engine control unit
Status: Confirmed
OBDII: Secondary air injection (AIR) system, bank 1 - malfunction
============2==============
P0492
Raw code: 0492
ECU: Engine control unit
Status: Confirmed
OBDII: Secondary air injection (AIR) system, bank 2 - malfunction
P0491
Raw code: 0491
ECU: Engine control unit
Status: Confirmed
OBDII: Secondary air injection (AIR) system, bank 1 - malfunction
============2==============
P0492
Raw code: 0492
ECU: Engine control unit
Status: Confirmed
OBDII: Secondary air injection (AIR) system, bank 2 - malfunction
The following users liked this post:
Al Allen (12-04-2023)
#14
Racer
P0491 Secondary Air Injection System, Bank 1 - Insufficient Flow
P0492 Secondary Air Injection System, Bank 2 - Insufficient Flow
Possible cause of fault
- Electrical fault in power supply or line between relay and secondary air injection pump
- Secondary air injection pump relay mechanically faulty
- Mechanical fault in electrical secondary air valve
- Pneumatic secondary air valve faulty/sluggish
- Electrical fault in secondary air injection pump
- Mechanical fault in secondary air injection pump or secondary air injection pump blocked
- Vacuum system leaking
- Air hose to secondary air injection pump slipped off or constricted
P0492 Secondary Air Injection System, Bank 2 - Insufficient Flow
Possible cause of fault
- Electrical fault in power supply or line between relay and secondary air injection pump
- Secondary air injection pump relay mechanically faulty
- Mechanical fault in electrical secondary air valve
- Pneumatic secondary air valve faulty/sluggish
- Electrical fault in secondary air injection pump
- Mechanical fault in secondary air injection pump or secondary air injection pump blocked
- Vacuum system leaking
- Air hose to secondary air injection pump slipped off or constricted
The following users liked this post:
Al Allen (12-04-2023)
#15