Q: Failed emissions, says that bank system 1 is too lean. The car had sat for almost a year.

asked by on

The car had sat for almost a complete year and had some problems with the intake manifold but we got it fix and we took it to emissions and it failed because it said that the bank system 1 is too lean. We just got a new knock sensor. We're wondering if it has to do with the IAC valve because it had sat for so long or if there is a vacuum or tube leak going on, so do we need to clean it or just get a whole new mass air flow sensor?

My car has 260000 miles.
My car has an automatic transmission.

Hello there, thank you for asking about your 1999 Nissan Altima. You need to fix any vacuum leak where un-metered air is getting in to the intake manifold. The additional air getting into the engine will cause the lean codes.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Failed emissions, says that bank system 1 is too lean. The car had sat for almost a year.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Things to do when getting smog test at Star station

Hi there. The smog test for vehicles of 1996 and newer will pass if the engine light is off and the gas cap passes the sealed test. As long as the gas cap is sealing to the fuel inlet tube...

Q: My Camry is starting at 2000 rpm's.

Sounds like there is a vacuum leak that is causing the engine to rev up high. If there is no vacuum leak, then the Idle Air Control Valve could be stuck causing the engine idle to fluctuate on startup. I...

Q: Q: Gears slipping.

If your automatic transmission is slipping, either the fluid is low or you have internal transmission problems (failed front pump, faulty pressure regulator, etc.). Even checking transmission fluid can be a difficult task, so this is one best left to...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.