Q: 2004 Nissan Titan running lean any suggestions

asked by on

Running lean

My car has 165000 miles.
My car has an automatic transmission.

The causes of lean operation, such as if you have diagnostic trouble code P0171 are easiest to pinpoint by looking at the secondary firing patterns on all cylinders. That will confirm if the too lean condition, that has caused a code to set, affects all or just a few cylinders, and in which bank of the engine. If not all cylinders are affected, test for defective individual fuel injectors. However, if all cylinders are affected, you would test, in turn: the fuel pressure regulator, fuel pump pressure, check for a clogged fuel filter, vacuum leak, faulty oxygen sensor(s) and faulty mass air flow sensor. Rarely, the cause will be a faulty powertrain control module. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a check engine light diagnostic - lean operation and the responding certified mechanic will get this resolved for you promptly. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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. 2004 Nissan Titan running lean any suggestions

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: Rear pinion seal leaking. Would i also need to change the flange?

The flange is integral with a splined yoke. The yoke segment (of the flange/yoke) has a precision, machined, highly polished surface which mates with the rubber seal. Since the rubber seal is spring loaded and is under tension against the...

Q: Q: Hesitation when accelerating.

You may have spark plug wires that are damaged or the plug you put in got damaged while putting it in the hole. If you accidentally closed the plug gap then the plug will cause a misfire. I recommend removing...

Q: while driving my titan it feels like it dragging or intermitenly slowing down

It's hard to say with this amount of information what the exact issue is. The truck could be slowing down for a number of reasons. Its going to take some more observations. Take notice of when it happens, i.e.: when...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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.