Have two recent problems with my 97 C280s w65K mi and I am trying to determine their relevance to each other - Three days ago my check engine light came on first time ever. What repairs can fix the P0170 code? You dont need tools to remove it. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage. If O2 sensors are causing both P0171 and P0174 banks to report a lean mixture, that would mean that both O2 sensors are misreading the amount of oxygen in the exhaust. Nothing obvious like cracks or anything. Using the grey vertical line as a median point, the injector pulse width is increased to the right red , to inject more fuel, and decreased to the left blue to inject less fuel. I bought 2 sensors, left and right, they are the same, but just in case, I'll replace both.
Cylinder 3 had a crack. Note that catalytic converter replacements can be hugely expensive, and that all other avenues must be explored to resolve the problem before a converter is replaced in error. This can mean a negative fuel trim or a positive fuel trim has been detected. Came back with code p0170 and P0173. The heater element in an oxygen sensor plays a critical role in the overall performance of the sensor, and a bad heater element or heater control circuit can cause wildly inaccurate readings, especially when the sensor is still cold. Make sure there are no vacuum leaks at the intake manifold gaskets or tears in the air supply hose.
But you have to replace the thermostat first. A P0170 is generally an air intake leak or vacuum leak, key culprits are all air intake boots and vacuum hoses, just look at all of them methodically , bend them, twist them, if they are split you will see cracks or they will tear. After the repairs are made, the mechanic would reset the Check Engine Light and run the engine. Also, the computer will run validation tests on the readings of the O2 sensors before looking at fuel trim adjustments. Symptoms of this code may vary depending on the vehicle and other conditions that are present.
But today i turned my car on and it gave me a check engine light. Consult the manual for the ideal fuel pressure range for the application being worked on, and follow the procedure outlined in the manual to test the actual fuel pressure in the system with a dedicated fuel pressure gauge. It may be clogged, or damaged due to the long-term effect of code P0170. As such, these requests are far less likely to cause a code to be stored. At first the problem was intermittent since I drove it to the shop later that day and it worked fine. In these cases, the underlying cause s of the oil contamination must be resolved before attempting to diagnose P0170.
Not sure if that makes sense. Please buy a Peake code reader No. Also includes links to relevant forum. This may include checking the engine for any issues that may cause it to run lean or rich and repairing them before moving forward. It also indicates that the fuel trims reached their limit of adding fuel while trying to compensate for a actual or perceived rich condition. What are the common causes of code P0170? A generic code reader will have you throwing thousands of dollars into repairing your car that aren't needed. The check valve should flow only one way.
It also indicates that the fuel trims reached their limit of adding fuel while trying to compensate for a actual or perceived rich condition. It is more common to see P0171, 0174, 0172, 0175 codes set with regard to fuel trim malfunctions on American cars. Quote Originally Posted by Check codes Good follow-up thanks. Now it isnt going anyway under its own power. The check valve should flow only one way. Just change the one closer to the engine, the one behind the Catalytic converter will thow a different code when it fails.
Drove the car just after for around a mile or so with no issues. Also be aware that that the severity of one or more symptoms may differ between applications. The shop read the codes but couldnt bring it into the shop until Monday. P0170 Fuel Trim Malfunction Bank 1 The code P0170 means that the air-fuel mixture coming in to the engine is too lean, or too rich. If your spark plugs look good, problems with your ignition system can also preventing a spark. This error codes really need parts to replace.
Step 3 Consult the manual on the input voltage, resistance, and reference voltage values for the post catalytic oxygen sensor. A bad O2 sensor could cause a P0170, or P0173. The code P0173 means the same, only for the Bank 2. Was not getting these codes till after replacing the vanos, this thing has gremlins or something. Now don't ask yourself; What should you do with P0170 code? P0170 means there was a malfunction in the computer's control of the air:fuel ratio.
Since, I drove almost 1000 miles, without any issues until the code came up. It got progressively worse then the computer started outputting the p0170 code along with an Check engine light came on. Car runs a bit rough under power related fine at idle. Spark plugs typically need to be replaced every season or 25 hours of use. Many of these codes are caused by issues that directly affect combustion, which could result in code P0170 being set. Im not too familliar with these things very much.
Common mistakes when diagnosing the P0170 code Some people may look online and find that one of the most common causes of this code would be the mass air flow sensor. Inspect the condition of crankcase vent hose under intake manifold and operation of check valve in the hose. The connector is prone to cracking and can trigger this fuel trim code. I am relacing both the Pre and post sensors , so will let you know what happens. It may also have a P0173 referring to the same malfunction but on bank two. The similarities between them may be why we don't see this code surface on domestic vehicles very often.