Skip the auto shop - Our mechanics make house calls

Q: Error code P0171 and P0374

asked by on

I used the OBD II / EOBD CODE READER and found the following code P0171 System too lean Bank 1 (Generic o) P0374 Timing Reference Hig n Resolution Signal A No Pulses (Generic o) P0171 System too lean Bank 1 (Gen Pd o) P0374 Timing Reference Hig n Resolution Signal A No Pulses (Gen Pd o) Freeze Frame: DTCFRZF P0171 Fuel sys 1 CL Fuel sys 2 -- Load_PCT (%) 75.29 ECT( ‘C) 78.00 SHRTFT1 (%) 0.00 LONGFT1 (%) 25.00 SHRTFT2 (%) 0.00 LONGFT2 (%) 25.00 MAP (kPa) 47.00 RPM(rpm) 705.50 VSS(km/h) 0.00 SPARKADV 4.5

I don’t feel anything while driving the 2006 Ford Five hundred SEL (I don’t have much knowledge about vehicles), It accelerates well and goes easily to 40miles per hour when given the acceleration (I have not tried beyond 40 miles/hr in order to avoid any damage, as I bought it recently and want to repair it before use) the odometer reads about 200,000 miles, I showed to a local mechanic he said the gear is either in 2nd or 3rd (limp mode) after a short test drive???

My car has 200000 miles.
My car has an automatic transmission.

Hi and thanks for contacting YourMechanic. If the vehicle went into limp mode, then the computer is making this happen to prevent the engine from any damage. Check the camshaft sensor for proper timing to the camshaft. Look at the harness and make sure that it is plugged in and free from any moisture. Since the engine is running good, the crankshaft sensor is working correctly. Disconnect the camshaft sensor and drive the vehicle around to see if there is any change to the performance of the engine.

If there was no change, then the camshaft sensor needs replaced. If it did change then, you will need to check the timing of the engine with a timing light. When checking with a timing light, make sure that the timing flash is on the same point. If the timing is not at the same point, then the engine will need a timing chain and / or tensioner. If the timing is steady, then the camshaft sensor needs replaced. If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from YourMechanic, that can assist you with the engine codes coming up.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: All warnings lamps are shawn in dashboard, and the gauges the acceleration and rpm are on 0 , also

It sounds like you may have a dashboard integration unit failure, or a fault within the electrical control unit (ECU). It's also possible that the instrument cluster itself is faulty. Have the vehicle scanned for diagnostic trouble codes (DTCs)...

Q: I took my car to Advance Auto and them do a check engine light diagnostic test and the code is C0245

Hello. Thanks for writing in. You may have two separate issues going on at once. The speed sensor code is likely due to sensor failure, or a bad connection. In the case of a bad connection, a good visual inspection...

Q: After 'check engine' light, diagnostic revealed P0171 and P0402

The first code, P0171, is an indication the engine is running lean. This code can indicate anything from clogged air and fuel filters to problems with O2 sensors and mass air flow sensors to intake gaskets. The other code,...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...