Question about 2003 Toyota Tacoma
Posted by Anonymous on
HO2S no. 1 heater circut is open or shorted
HO2S no. 1 is defective
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)
Posted on Mar 16, 2011
1999 jaguar xk8 code reading. p1646 p1647 p1165 p0141
Posted on Jan 26, 2013
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Posted on Jan 02, 2017
Posted on Jul 27, 2010
This code refers to the front oxygen sensor on Bank
1. The heated circuit in the oxygen sensor decreases time needed to enter
closed loop. As the O2 heater reaches operating temperature, the oxygen sensor
responds by switching according to oxygen content of the exhaust surrounding
it. The ECM tracks how long it takes for the oxygen sensor to begin switching.
It the ECM determines (based on coolant temp) that too much time elapsed before
the oxygen sensor began operating properly, it will set P0135.
Repair short or open or high resistance in wiring harness or harness connectors.
Since you have already changed out your O2 sensor (as long as you used to OEM replacement and not the "Universal" replacement) you should not have to replace it again. You might check your thermostat to part of the time it takes for the O2 sensor to start switching being based on coolant temp, if your thermostat is not operating properly, it could cause the coolant temp to take longer than what is considered by the ECM to be normal.
Posted on Feb 22, 2009
PO135 is oxygen sensor Bank1 sensor1. PO404 is EGR.
personally, I'd pull EGR off, clean pintle good with throttle body cleaner or carb cleaner, re-install, erase codes & try it for a while & see if it code(s) come back.
Posted on May 07, 2009
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