Question about 2003 Jaguar X-Type

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Engine light on 3 codes in system

I have 3 codes p-1000 fuel and air metering aux emission control-
also p-0174 bank 2 running lean and p-0171 bank 1 running lean

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  • Anonymous Mar 19, 2014

    as soon as the the code po171 comes on the car has no power

  • Anonymous Mar 29, 2014

    running lean both banks

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The lean running codes are related to the p-1000 code...

Running lean on bank 1 and bank 2 means your oxygen sensors sense too much oxygen in your exhaust flow. This means either your engine is getting unmetered air (air that the engine does not know is coming in, therefore does not send fuel to compensate for...) (air that your mass air flow sensor does not see). You could have either a bad mass air flow (MAF) sensor (in the intake piping after the filter; this sensor tells your engine how much air it's taking in, so it can send the right amount of fuel through the injectors to properly burn with the air available with as little emissions as possible), or you could also have a cracked/broken intake piping after this sensor which lets air in the intake that the sensor does not measure... A large vacuum leak could also let unmetered air in the engine.

Or... Another possibility here would be low fuel pressure (bad fuel pump, bad fuel pressure regulator, fuel leak), as not enough fuel for the air would also cause the same lean condition.

It could be that some oxygen sensors are bad...

These conditions are hard to pinpoint exactly unless you have a scanner that can read sensor data (MAF Flow, fuel pressure, oxygen sensor values)...

The first thing I'd do would be to check for cracks or damage in the intake piping... If there is none, then it might be a low fuel pressure issue, or sensor problems...

Posted on May 08, 2009

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1 Answer

What are the probable causes of DTCs P0171 and P0174?


code p 0171 refers to system too lean bank 1===causes --intake /exhaust leak---AIR system---MAF/VAF sensor---fuel pressure/pump---injector/s---HO2S
In this case I would suspect the heated oxygen sensor (HO2S)
then check fro a cracked flex section in the exhaust before the cat converter
code p 0174 refers to system too lean bank 2---causes intake /exhaust leak--fuel pressure/pump---injector/s---AIR system---hose connection/s

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1 Answer

My check engine light is on. it is pulling 4 codes P0302 P1670 P0174 P0171


code p 0302 is a misfire on no 2 cylinder
check that the plug lead is on properly, that the lead is operational
move the injector from 2 to another cylinder and see if the misfire follows the move
code p 0174 refers to system too lean bank 2===causes intake /exhaust leak---fuel pressure / pump---injector/s--AIR system--hose connection/s
code p 0171 refers to system too lean bank 1=== causes intake /exhaust leak---AIR system---MAF/VAF sensors---fuel pressure / pump---injector/s -- HO2S
You stated that you replaced the O2 sensor but that is different to the HO2S sensor , does a different job and controls the air/fuel mixture from the ECM
because it has banks 1 and 2 it is a v engine and you will have a HO2S in the exhaust manifold or before the cat converter for each exhaust
O2 sensors are after the cat converter and confirm the HO2S settings for the ECM
to put the lights out , use a scan tool to reset the ECM

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1 Answer

I have the codes are po171 ..po174


code p 0171 refers to system too lean bank 1===causes --intake /exhaust leak---air system---MAF/VAF sensor--fuel pressure / pump---injector/ s---HO2S
code p 0172 refers to system too rich, bank 1===causes --intake blocked ---EVAP canister purge valve --fuel pressure --EGR system---injector/s -=-- HO2S
code p 0173 refers to fuel trim(FT) bank 2--malfunction===causes --intake leak---air system--fuel pressure /pump---injector/s --EVAP canister purge valve---HO2S
code p 0174 refers to system too lean, bank 2===causes intake / exhaust leak---fuel pressure /pump---injector/s---Air system---hose connection/s
I was not sure if you wanted all codes or just the first and last, however you will see that there are some common problems that may help point you in the right direction
1-- is the heated oxygen sensor (HO2S) which is the sensor before the cat converter
2--is the fuel pressure , so a fuel pressure test will determine if a regulator or fuel pump problem,
3--EVAP canister purge valve --replace as required
4--intake / exhaust leak --check for vacuum hose failure including hoses to vent controls and check the flexible exhaust connection before the cat converter for leaks
The rest are there to check if you haven't fix the fault before you get to them

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1 Answer

P0174 and p0171


Well it depends on what the problem is.
The two codes are for the fuel system being too lean on both banks. You have an O2 sensor on each bank that sends data to the computer telling it if the fuel mixture is too rich or too lean. The computer adjusts the on time for the injectors based on that and other data.
The most common reason you would get those two codes at the same time is low fuel pressure. So the fuel pressure would need to be checked along with the O2 sensors.

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1 Answer

Codes 0171 0174, 0316,0430


code p0171 refers to system too lean bank 1 causes---intake exhaust leak--- AIR system----MAF?VAF sensor fuel pressure/ pump injectors HO2S
code p0174 refers to System to lean bank 2 causes the same except Maf and vaf are not mentioned and hose connections are added
code p0316 refers to misfire detected at star up first 1000 revs causes ---engine mechanicval fault---wiring---ignition/ fuel system--injector
code p0430 refers to cat convertersystem bank 2-- effeciency below threshold causes ----cat converter--- wiring ----HO2S. Personally I would chewck the cat converter first as if it is blocking the exhaust system the ret of the sensors will have irregular readings.

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0174 lean condition bank 2, and 0171 is lean bank 1. Either this is in need of a whosale of repairs or you have computer issues, From looking at the codes i would first do a complete tune up, Including wires, And inspect for a vacume leak before replacing any 02 sensors..
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Check engine codes 97 ford exp v8 codes:0358 0171 0174


P0171 and 174 System Too Lean
Basically this means that an oxygen sensor in banks 1 and 2 detected a lean condition (too much oxygen in the exhaust).

These codes may mean that one or more of the following has happened:
•The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
•There could be a vacuum leak downstream of the MAF sensor.

•In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling.
•Inspect all vacuum and PCV hoses, replace if necessary
•Check for a dirty fuel filter and proper fuel pressure

P0358 Ignition Coil H Primary/Secondary Circuit Malfunction
Code P0358 is for cylinder #8.

Inspect the spark plug, coil, and coil boot on that cylinder for signs of damage. Replace as needed.

If no problems are found with the components, check the wiring harness from the coil to the Powertrain Control Module (PCM).

Potential Causes: Failed coil or boot
Failed spark plug
Harness problem

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2000 Lincoln LS and the Engine Light came on. Codes 0171 0174


you probably have a vacuum leak. check all your hoses pcv hose for sure. it means the engine is seeing too much air with the fuel.

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2003 pontiac sunfire GT


When they say "bank," they're referring to cylinder banks 1 or 2. Bank 1 is the passenger's side and has cylinders 1-4 on it. Bank 2 is the driver's side and has cylinders 5-8 on it.

P0171/0174 indicates that the long term fuel trims have reached a maximum (should be somewhere around 30-35%). Fuel trims are how much fuel the PCM adds or subtracts. 0171/0174 indicates that the engine is running lean, meaning that outside air is getting past the mass air sensor. The O2 sensors see this excess air and the PCM responds by cranking up fuel trims to add more fuel for that more air.

Possible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

Jun 09, 2008 | 2003 Pontiac Sunfire

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