2002 dodge caravan engine light on code showing p0135 .please advice.thanks.

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

A good technican.

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.

P0301 Cylinder #1 misfire. First of all check Spark plug, plug wire, Compression in #1 cylinder and if all are fine then I would be looking at the fuel pump !

i have a 3.8 v6 2003 and I change both of the oxygen sensor and the Engine Light now comes ON and OFF whenever it wants. im going crazy about that, don't know what to do. Little help will be thankful. thanks Att: Johan

code p0135 refers to heated oxygen (HO2S) sensor 1 bank 1 heater control---circuit malfunction===causes wiring--fuse HO2S ---ECM
he brand should not matter as long as it it is a quality unit
what does matter is wire damage from not using the correct socket for the installation process that causes wire damage

Here are the reasons for that code:

HO2S no. 1 heater circut is open or shorted
HO2S no. 1 is defective
Defective ECM

Using a scan tool, read freeze frame data. Freeze fram data records engine conditions when a malfunction is detected.

Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe ECM harness connector. If DTC P0135 is set, measure voltage between ground and terminal No. 3 (Blue/Black wire) at ECM harness connector E10. If DTC P0155 is set, measure voltage between ground and terminal No. 4 (Yellow/Red wire) at ECM harness E10. Voltage should be 9-14 volts at each terminal. If voltage is as specified, replace ECM.

If not, Disconnect suspect HO2S No. 1 harness connector. Measure resistance between terminals B+ (Black/Yellow wire) and HT (Blue/Black wire on bank No. 1 ; Yellow/Red wire on bank No. 2) at HO2S connector (component side). Resistance should be 11-16 ohms at 68 degrees F and 23-32 ohms at 1472 degrees F. If resistance are not specified, replace appropriate HO2S. If resistance are specified, Repair wiring between ECM and appropriate HO2S, or between appropriate HO2S and EFI main relay (Black/Yellow wire at HO2S and Red wire at EFI main relay)

have codes red with a OBDII at a parts store..maybe O2 sensor causing light to come on..the OBD II will tell you...its free service and please vote

135 is O2 Sensor Heater Circuit (bank 1 sensor1)

456 is Evaporative Emmission Control System
very small leak detected

Here are the links: http://www.obd-codes.com/p0135

http://dodgeforum.com/forum/3rd-gen-ram/26914-p0406-exhaust-gas-recirculation-sensor-a-circuit-high.html