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Re: engine light on 3 codes in system
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...
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code p 0171 refers to system too lean bank 1===causes ---intake /exhaust leak---AIR system----MAF/VAF sensor---fuel pressure/pump---injectors/s--- heated oxygen sensor (HO2S in the exhaust manifold before the cat converter)
for this code the most likely fault will be the HO2S unit as it reads the exhaust gas composition and reports to the ECM so that the air/fuel ratio can be corrected
code p 0174 refers to system too lean bank 2===causes -same as for p 0171
fuel trim is what the ECM does after it receives an constant flow of information from all of the sensors and it alters the air / fuel ratio for the new parameters
you will have noticed a change in engine performance and fuel economy when driving at a constant speed over a distance or conversely a loss of economy when reverting to city driving
It also explains the advertised fuel economy figures --one for city driving and a better figure for highway driving
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
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
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
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.
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.
The P0355 code is, "Ignition Coil E Primary/Secondary Circuit Malfunction" this has to do with the coil(s) and the coil may be going bad, or you have a bad wire / plug (connection) to the coil. P0171 is "System Too Lean (Bank 1)" and P0174 is " System Too Lean (Bank 2)" . The P017X codes mean your ox2 sensors are picking up a lean burn condition. Engine running to warm (hot) or your coolant temp sensor is not reading right or one of the ox2 sensors (Bank 1) is going bad. Hard to trouble shoot this from my computer desk.
Hi, 1151 is an 02 sensor code, 1131 is also 02 sensor code, 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.. Take care
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