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What are these plastic tubes on a 2001 Impala 3.8L?

I have a 2001 Impala 3.8L. I popped off the engine cover because I need to change the thermostat, and noticed that two tiny plastic lines are broken. They go in to something (not sure what, I'm still learning) that's basically directly above the thermostat housing. In the image at they start together, on the far right towards the middle. The right-hand line from the number two passes over them just after they elbow; after that, they split and go to different things. Both of these are broken where they join that structure above the thermostat housing. The car seems to be running fine. I suspect they're lines for O2 sensors or something but that's a guess...the check engine light is on. I'd just like to know what they are and what to search for to find a replacement. Any help would be greatly appreciated.

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  • Colin Kirk Jul 16, 2013

    This is a picture of the hoses in question. I'm pointing to where they are broken.



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Posted on Jan 02, 2017

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SOURCE: 2002 impala 3.8L 180,000kms. Having

it is possibly the throttle position sensor(tps) malfunctioning. basically the computer or "brain" of the car thinks the throttle is in a different position than it really is and automatically makes adjustments to fuel, air ect.... based on these false readings from the sensor thus causing the engine to react a little different when you expect to have power.

Posted on May 14, 2011

  • 17970 Answers

SOURCE: 2002 nissan maxima, check engine

About DTC P1800, I suggest check the harness and verify it is plugged in and still functioning. Also, try checking your vac tubes to verify that they are not reversed. Also read this TSB with details about correct diagnostic: DTC P1800 VIAS CONTROL SOLENOID VALVE

The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve control. It responds to ON/OFF signals from the ECM. When the solenoid is off, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and feeds the vacuum signal to the power valve actuator.

DTC detecting condition:
• An excessively low or high voltage signal is sent to ECM through the valve
Possible cause:
• Harness or connectors (The solenoid valve circuit is open or shorted.)
• VIAS control solenoid valve

Will need replaced the solenoid valve (P/N - 149558J10A). The valve is located under the engine cover. It's a Nissan only part so you have to order from the dealer, either online or in person. It's cheaper online. Check this sample Nissan engine location (click image for zoom)...


DTC P1147 - Bank1 Sensor 2 O2 sensor maximum voltage monitoring
Component Description: The heated oxygen sensor 2, after three way catalyst, monitors the oxygen level in the exhaust gas on each bank.

Even if switching characteristics of the heated oxygen sensor 1 are shifted, the air fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2.

This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

DTC detecting condition: The maximum voltage from the sensor is not reached to the specified voltage.

Possible cause:
Harness or connectors (The sensor circuit is open or shorted)
Heated oxygen sensor 2
Fuel pressure

Majority of cases this is either a faulty O2 sensor, or short/open in wiring harness. Bank1 sensor2 is the rear O2 sensor on the passenger (right) hand side (click image for zoom):


Here is simple test with voltmeter to test O2 sensor. If it fails test, replace sensor. If not, then you will have to start tracing the wiring harness for a short/open in it (click for zoom):


And here additional details: DTC P1147 O2 Sensor

Keep us updated.

Posted on Aug 01, 2011

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Please chek this link for replacing the thermostat...

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