I have a 2004 Dodge Grand Caravan with a 3.8 and recently replaced the upstream O2 sensor and now get a p0135 engine code. What is the problem? I used a Bosch sensor. I was able to clear out the code but then there are times I also get the p0132 code. I did exchange the sensor already and replaced it with the same brand. Do I need to use a different manufacturer for the O2 sensor?

Replace both sensors with mopar,some aftermarket sensors are not compatible

How to Diagnose a P0135 -Heater
Performance Bank 1 Sensor 1 (GM 3.5L) January 31, 2012 Updated: October 29, 2014 Written by: Abraham Torres-Arredondo Article Id: 371

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If your check engine light is on and you have a diagnostic trouble code P0135 stored in the PCM's memory... then you've come to the right place to test and troubleshoot the upstream oxygen sensor.
A P0135 DTC says: HO2S Heater Performance Bank 1 Sensor 1... and this means that the PCM (Powertrain Control Module = Fuel Injection Computer) has detected a problem with the front oxygen sensor's heater element or a problem in the heater's circuit (wires).
In this tutorial, I'll show you how to check the oxygen (O2) sensor's heater element and the two circuits that feed it with power (10 to 12 Volts) and ground with a multimeter.
In case you're wondering, where the oxygen (O2) sensor that the code P0135 is accusing of being BAD is... this bad boy is located on the exhaust manifold and before the catalytic converter.
To help you navigate this article, here are its main points:

1. Symptoms of a BAD Oxygen Sensor Heater Element.
2. What Tools Do I Need to Test Code P0135?
3. What Does the Heater Inside the Oxygen Sensor Do?
4. Circuit Descriptions of the Downstream Oxygen Sensor.
5. Start Here.
6. TEST 1: Oxygen Sensor Bank 1 Sensor 1 Test.
7. TEST 2: Checking 12 Volts to O2 Heater.
8. TEST 3: Checking the O2 Heater's Ground Circuit.
9. TEST 4: Ohming the O2 Heater Element.
10. P0135 O2 Sensor Heater Test Summary.

Buying a Digital Multimeter for Automotive Diagnostic Testing (found at: easyautodiagnostics.com).

Scan Tool.

1. Don't have one?... check out my recommendation: Abe's Scan Tool Recommendation.

Wire Piercing Probe.

1. Although this tool is not an absolute must, if you do buy one, you'll realize just how easy it makes testing the voltages inside the wires.
2. If you need to see what this tool looks like, you can see it here:Wire Piercing Probe.

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Applies To:

Buick Vehicles:

• Rainier 4.2L
  • 2004, 2005

Chevrolet Vehicles:

• Colorado 3.5L
  • 2004, 2005
• Trailblazer
  • 2004, 2005

3.5L
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How To Test for a Blown Head Gasket (GM 3.5L -FWD)
All Articles: 3.5L "A day without sunshine is like, you know, night"
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Code 135 should be a problem with the heater circuit for O2 sensor bank one sensor one. The O2 sensors have a heater to make them work as soon as the engine is started. The problem could be the sensor or the heater circuit.

bank 1 sensor 1 is the o2 sensor on the bank with cylinder #1 on the engine side of the catalytic converter.

When "check engine" litgh tun on, the PCM (computer) is warning that some fault code is stored there. Autozone could scanned your PCM and show exactly what fault codes is there; if your O2 sensors was replaced, I assuming that they can see this codes... so, they reset and delete all codes stored there? Scanned the PCM after this change?

Keep us updated-

P0135 = O2 sensor heater circuit malfunction (bank 1, sensor 1)

With no other symptoms other than the above code, I would think it was the O2 sensor.

There are two oxygen sensors: one is upstream of the catalytic converter and one downstream of the catalytic converter. The oxygen sensor, or O2 sensor is usually located near the catalytic converter.Oxygen sensor downstream of the catalytic converter in the exhaust system on the back of the engine. ------- Thanks.Helpmech

Is it Code P1035 or P0135?
It is the Upstream Sensor. 100 Codes ending in 30 thru 35 are dealing with the Upstream Sensor. 100 Codes ending in 36 thru 41 are dealing with the Downstream Sensor.

Let me know if this helped.....

The P1684 code simply means that the battery has been disconneted within the last 50 starts.

O2 sensors are tricky. sometimes like anything else they fail. many times though the exhaust mixture they encounter is out of their range and that shows up as a failure.since you seem to have no other problems , I would go ahead and change them, but don't be disappointed if the code shows up again (at least you know it's not the sensors.) I don't like using the process of elimination when doing repairs but sometimes you must.