Fix P013C: Mechanic’s solutions that WORKED

The P013C: O2 Sensor Slow Response – Rich to Lean (Bank 2 Sensor 2) code highlights a fault in the oxygen sensor’s response time, particularly when transitioning from a rich to a lean condition. This sensor, located in Bank 2 Sensor 2, plays a crucial role in regulating emissions and ensuring optimal engine performance. A delay in response can indicate issues in the exhaust system or with the sensor itself.

P013C quick overview

Meaning	P013C: O2 Sensor Slow Response – Rich to Lean (Bank 2 Sensor 2)
Is it serious?	This code indicates a potential issue with the vehicle’s emissions system, which should be addressed but is typically not an immediate threat to vehicle operation.
Possible causes	– Faulty or slow-responding oxygen sensor (Bank 2 Sensor 2) – Exhaust leaks near the affected sensor – Incorrectly installed or incompatible oxygen sensors – Damaged or corroded wiring and connectors for the sensor – Issues with the vehicle’s exhaust system affecting sensor readings
How to diagnose?	Perform Visual Inspection: Check for visible signs of exhaust leaks and damaged wiring. Conduct Smoke Test: Use a smoke machine to detect any small or hidden leaks in the exhaust system. Check Sensor Brand: Ensure the correct type and brand of oxygen sensors are installed. Review Repair History: Look at past repairs related to exhaust or oxygen sensors for clues. Use Diagnostic Tools: Utilize an oscilloscope or scan tool to analyze the oxygen sensor’s performance. Monitor During Drive: Observe sensor data, especially during highway deceleration.

How to fix P013C – learn from mechanics

I looked into P013C service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.

Case #1: Jeep

Vehicle Information: 2008 Jeep Commander Limited 5.7L, MIL Lamp on, P013C code

Issue + Repair History:

• Initially had P0430 code.
• After latest flash installation, the customer returned 100 miles later with P013C code.
• Suspected issue related to the downstream O2 sensor.

Suggestions to Fix Issue:

• Check for issues with the downstream O2 sensor, exhaust leak, or wiring.
• Consider the possibility of a bad catalytic converter.
• Ensure the vehicle is warmed up, runs at 60+ mph for over 2 minutes, then goes through a 0% throttle deceleration.
• Check for microscopic exhaust leaks near downstream O2 sensor. Suggested pressurizing tailpipe with 10 PSI and using a bubble solution for detection.
• Replace the 2/2 O2 sensor if no exhaust leak is found.
• Replacement of the catalytic converter may be necessary, especially since a flash update was already performed.

Final Fix:

• A smoke test of the exhaust revealed a very small leak where the two headers are welded together into one pipe right before the muffler, about 8-10 inches from the downstream O2 sensor.
• The vehicle owner is attempting to get Jeep to cover the repair, but the technician is confident this leak is the cause of the issue.

Case #2: Chrysler

Vehicle Information: 2009 Chrysler Aspen Limited 5.7L, MIL Lamp on, P013C code

Issue + Repair History:

• Customer (used car dealer) reported intermittent P013C code, previously seen by two other shops.
• Both downstream sensors replaced with OEM parts at another shop.
• Extensive testing conducted including driving under freeze frame conditions, exhaust leak checks, cat removal and bench leak check, exhaust manifold smoke check, and voltage checks at connector and PCM.

Other Test Results:

• Test drive revealed no failures.
• Leak checks on bank 2 cat and manifold found no leaks.
• Connector voltage: Return 2.51 V, Signal 4.09 V.

Suggestions to Fix Issue:

• Check for variance in digital multimeter or scanner readings.
• Perform oxygen storage test on the converter.
• Review TSB 18-012-07.
• Load testing of wires.
• Compare voltages with B1S2, consider swapping sensors side to side.
• Check all ECM and sensor grounds for voltage drop.
• Consider the possibility of a porous exhaust or a lazy O2 sensor.
• Restrict tailpipe and listen for leaks with a stethoscope.
• Pressurize exhaust with air pressure and use soapy water for leak detection.

Final Fix:

• After reassembling the Y-pipe and conducting a pressure test, no leaks were found except where the Y-pipe is connected under the transmission.
• Discovered that leakage at the Y-pipe connection seemed to be by design.
• Found TSB 08-002-10 for “various drivability concerns,” including P013C, and performed the recommended flash.
• No problems reported for over two weeks after the flash, and the technician will update if the issue returns.

Case #3: Ford

Vehicle Information: 2013 Ford Explorer XLT 3.5L, experiencing misfire

Issue + Repair History:

• Bucking problem mostly around 1500 to 2000 rpm.
• Misfire-like symptoms or possible TPS issue, but occurs at higher RPMs occasionally.
• O2 code for exhaust leak at flange by the sensor, fixed but issue persisted.
• No misfire counts present or history, nothing in Mode 6.
• Replaced factory spark plugs, but issue remained.

Suggestions to Fix Issue:

• Check for torque converter shudder, monitor transmission data.
• Scope the CKP and add a math channel for frequency to detect misfires.
• Replace all coil packs as they might be breaking down.
• Inspect the dirty throttle body, air filter, MAF data, Baro, and fuel trims.
• Check fuel pressure and post data for further analysis.
• Stop converter from locking up to see if the bucking stops.
• Check for coil shooting out through the side of the boot rather than firing the plug.
• Examine fuel trims at various RPMs and loads.
• View COP current with a scope and amp clamp around the power feed to all coils.
• Touch exhaust manifold runners upon cold start-up to detect bad injectors.
• Track misfiring on scanner, replace coil connectors/boots.
• Check for misfires in OBD mode 6, consider long throttle up at highway speed.
• Try lubegard instant shudder fix for converter shudder.

Final Fix:

• The issue was the TCC (Torque Converter Clutch).
• Changed the transmission fluid with friction modifier, which resolved the bucking issue.
• Plan to have more faith in scanner data in the future.

Case #4:

Vehicle Information: 2008 Jeep Grand Cherokee Limited 5.7L, MIL Lamp on, P013C code

Issue + Repair History:

• Customer noticed MIL on during vehicle purchase; dealer promised to fix it.
• Code P013C (bank 2 sensor 2 slow switching) identified.
• Vehicle had 4 new oxygen sensors installed before coming to the current technician.
• The light reappeared shortly after code clearance and starting a new drive cycle.

Related Repair History:

• All four oxygen sensors were newly installed.

Suggestions to Fix Issue:

• Check for exhaust leaks, particularly around the Y-pipe welds.
• Confirm the brand of the installed O2 sensors.
• Smoke test the exhaust system for pinhole leaks between the catalytic converters.
• Use a scope on the rear oxygen sensors for comparison.
• Inspect manifolds for leaks, especially the bolts.
• Check for potential PCM and TCM reprogramming needs.
• Monitor rear sensor data on highway deceleration.
• Check for biased front sensor affecting fuel trims.
• Look for micro cracks in the exhaust system, particularly if the tailpipe was previously re-secured.

Final Fix:

• A smoke test revealed leaks on top of the exhaust pipes going into the converter, which were not visible due to their location.
• Repair required removing the “Y” pipe and converter assembly for welding or potential replacement.
• The customer discussed the issue with the dealer, and the dealer sought confirmation from a Jeep dealer, resulting in an estimate of $2500.
• The customer is currently in discussions with the dealer about the vehicle’s repair.

Advice	Description of Diagnostic Step
Check for Exhaust Leaks	Inspect the exhaust system, particularly around welds and flanges, for any leaks.
Smoke Test the Exhaust	Conduct a smoke test to identify any small or hidden leaks in the exhaust system.
Inspect Oxygen Sensors	Ensure the correct brand and type of oxygen sensors are installed and functioning properly.
Review Related Repair History	Consider previous repairs or replacements related to the exhaust system or sensors.
Use a Scope for Sensor Analysis	Utilize an oscilloscope to compare the performance of rear oxygen sensors and check for irregularities.
Monitor Data on Highway Drive	Observe sensor data, especially during highway deceleration, to identify any unusual patterns.
Consider Vehicle-Specific TSBs	Check for any Technical Service Bulletins related to the vehicle that might address this issue.