Good luck and keep us posted on your progress. But, like anything that causes the service engine soon light to come on it is a good idea to have it fixed as soon as possible. Please or to join the conversation. Sometimes it feels great and then it will bog down, not want to move very quickly and won't be very responsive. It has been having a hard time starting on first start up so I checked the fuel pressure and builds up nice and then drops fast. I have a 2004 Chevy Tahoe with the 5.
This often turns out to be the sensor. Alt ground, Battery ground and Trans ground. How to check the condition of the Catalytic Converter Catalytic Converter Problems: Wish I could help more, but. Learn how to replace the upstream oxygen sensors in your truck in a few simple steps. If you have other electrical demons. After I did the regulator I noticed that the power was much better at first, after a few drives it's started to come and go.
You may need a breaker bar for extra leverage. However if you have other codes present, like lean codes or pre-o2 sensor codes, then they may cause drivability problems as well as P0143 Chevrolet. Can you look at the pigtail connector on the O2 sensor and look for signs of abrasion right after the connector? The Engine Control Module adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. Important If the voltage is measured with a 10 megaohm digital voltmeter, the voltage may read as low as 0. The numbers below refer to the step numbers on the diagnostic table. P0157 Causes: Chevy Silverado Here are the most common issues that cause the P0157 code in the Chevy Silverado. Fuel System Diagnosis must be performed in order to determine the cause of the problem.
A warm-up cycle occurs when the coolant temperature has risen 22°C 40°F from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70°C 158°F during the same ignition cycle. One thing it says is low fuel pressure could cause the code, would bad check valve at the fuel pump cause this? P0157 code definition Oxygen Sensor Circuit Low Voltage Bank 2 Sensor 2 What the P0157 code means The oxygen sensor that trouble code P0157 refers to, is located in the rear of the exhaust and behind the catalytic converter. The upstream oxygen sensors are located between the exhaust manifold and the exhaust. What causes the P0157 code? As for fuel economy, I have noticed that it has started to dwindle lately. Sometimes the stutter feels like the engine might stall.
If a spark is visible, replace the wires. Use the current misfire counter in order to determine which cylinder is misfiring. Replaced the cat a few months ago 97 Sierra and the old one was empty,all the catalyst went into the muffler the mech said. The problem can be anywhere in between. Check your battery and make sure positive and ground are tight. In either case, replacing the sensor can be an effective way to diagnose the problem.
Blew through the exhaust pipe with a compressure and feel like there is no restriction now. Extremely frustrated as family vacation in 5 days and driving the Tahoe. Rotate the valve while moving it up and down in the guide to see if it binds. From the code I assume you hit the reference or ground wire on either the O2 pigtail or harness. It's important to check the connections, terminals along with the wire condition, in the entire circuit. Also, the check engine light only comes on at highway speed and full throttle.
Reassemble the cylinder heads using new valve seals. When I started the vehicle to back it into the garage it coated the garage floor with cat fines. This is because the converter can only let a fraction of the amount of exhaust through that it normally can. I had a Chevy in my fleet that went through a hand full of aftermarket sensors before we went factory and the problem never came back. Have always done regular oil changes myself and have always inspected for impurities. What repairs can fix the P0157 code? It occasionally shows a check engine light for rear 02 sensor low voltage and it has almost no power when cold and low end is always weak. Proper fuel pressure should be at 40 psi.
One other thing to consider is that your car could be running lean or rich causing these errors. Sensor 2 is mostly about checking to see that the exhaust has been scrubbed by the catalytic converter. I'll post another reply once I've done a few more things. Make sure that there is battery voltage present and ground present for the o2 sensor heater. There's no possible way you will need a whole new engine harness. For more information, refer to fuel supply system.
If you find the heater element bad, replace the sensor. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. Refer to for the 5. How many wires did your buddy cut and repair? Utah winter set in so I parked if for the winter, once the weather started warming up I changed the spark plugs which didn't do anything either, I tested the fuel pressure and it was only at 26 psi and wouldn't hold so I replaced the the fuel pump. Is there anything else i can do? Coolant is also top notch. My question is will the check valve have any effect on the low voltage to the sensor? Usually heater problems have codes associated with them, too. Did you solve this problem? Ever had either of these two codes before the repair? I just bought a 2000 Silverado with a 4.