LEV to ULEV engine swap headaches (p0135)
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LEV to ULEV engine swap headaches (p0135)
Hello
I swapped a ULEV 2000 into a 2001 Accord that had a LEV motor. All the connections fit and none were left over. Both have a distributor. The upstream sensor is from the ULEV but the downstream one is from the LEV tests good. Car runs great at start up but after a few min when given gas it will only go to about 2500rpm then will cut out and bounce unless you back off the gas. Fuel pressure good. PCM is original one from car so it was for LEV maybe this is problem? As stated engines both had all same connections and connectors. As stated it has a p0135 code that instantly returns on startup after clearing.
Any serious ideas appreciated.
I swapped a ULEV 2000 into a 2001 Accord that had a LEV motor. All the connections fit and none were left over. Both have a distributor. The upstream sensor is from the ULEV but the downstream one is from the LEV tests good. Car runs great at start up but after a few min when given gas it will only go to about 2500rpm then will cut out and bounce unless you back off the gas. Fuel pressure good. PCM is original one from car so it was for LEV maybe this is problem? As stated engines both had all same connections and connectors. As stated it has a p0135 code that instantly returns on startup after clearing.
Any serious ideas appreciated.
Honda-Tech Member
Joined: Jan 2025
Posts: 88
Likes: 14
From: Central FL
Re: LEV to ULEV engine swap headaches (p0135)
Hello
I swapped a ULEV 2000 into a 2001 Accord that had a LEV motor. All the connections fit and none were left over. Both have a distributor. The upstream sensor is from the ULEV but the downstream one is from the LEV tests good. Car runs great at start up but after a few min when given gas it will only go to about 2500rpm then will cut out and bounce unless you back off the gas. Fuel pressure good. PCM is original one from car so it was for LEV maybe this is problem? As stated engines both had all same connections and connectors. As stated it has a p0135 code that instantly returns on startup after clearing.
Any serious ideas appreciated.
I swapped a ULEV 2000 into a 2001 Accord that had a LEV motor. All the connections fit and none were left over. Both have a distributor. The upstream sensor is from the ULEV but the downstream one is from the LEV tests good. Car runs great at start up but after a few min when given gas it will only go to about 2500rpm then will cut out and bounce unless you back off the gas. Fuel pressure good. PCM is original one from car so it was for LEV maybe this is problem? As stated engines both had all same connections and connectors. As stated it has a p0135 code that instantly returns on startup after clearing.
Any serious ideas appreciated.
Match the 02 sensors to the engine being used.
-RC
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Joined: Jul 2004
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Likes: 515
Re: LEV to ULEV engine swap headaches (p0135)
Hello
I swapped a ULEV 2000 into a 2001 Accord that had a LEV motor. All the connections fit and none were left over. Both have a distributor. The upstream sensor is from the ULEV but the downstream one is from the LEV tests good. Car runs great at start up but after a few min when given gas it will only go to about 2500rpm then will cut out and bounce unless you back off the gas. Fuel pressure good. PCM is original one from car so it was for LEV maybe this is problem? As stated engines both had all same connections and connectors. As stated it has a p0135 code that instantly returns on startup after clearing.
Any serious ideas appreciated.
I swapped a ULEV 2000 into a 2001 Accord that had a LEV motor. All the connections fit and none were left over. Both have a distributor. The upstream sensor is from the ULEV but the downstream one is from the LEV tests good. Car runs great at start up but after a few min when given gas it will only go to about 2500rpm then will cut out and bounce unless you back off the gas. Fuel pressure good. PCM is original one from car so it was for LEV maybe this is problem? As stated engines both had all same connections and connectors. As stated it has a p0135 code that instantly returns on startup after clearing.
Any serious ideas appreciated.
The P0135 is an O2 sensor trouble code.
Use the O2 sensor from original engine.
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