What causes Ford code 137?

A blocked intake or air filter on bank 2 drives bank 2 rich. High fuel pressure overfuels bank 2. A leaking injector on bank 2 overfuels that bank. Fuel vapor from a restricted breather or EVAP fault richens bank 2. A lazy HO2S on bank 2 cannot correct the mixture.

How do I fix Ford code 137?

Check the bank 2 intake and air filter for a blockage. Measure fuel pressure and compare it with spec, since this fault reads high. Check the bank 2 injectors for a leaking one and check fuel pressure. Test the bank 2 HO2S and replace it only if it fails its own test. Test the ECM last, only after every circuit test has passed. Clear the code, then retest to confirm bank 2 runs at the target mixture.

Ford 137 System indicates rich (bank no

Q: What does Ford code 137 mean?

Ford code 137. System indicates rich (bank no. 2).

Make: Ford (1981-1995)
Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light

How to read it

Code 137 reads as 1 flash, pause, 3 flashes, pause, 7 flashes on the check-engine light. Jumper the self-test input to signal return at the test connector, then run the key on engine off self test and the running self test, counting the check-engine flashes each time.

New to flash codes? The How to Read Ford EEC-IV Self-Test Codes walks through the test and what the numbers mean. The general OBD-I guide covers the rest.

What does Ford code 137 mean?

System indicates rich (bank no. 2)

Common causes of 137

A blocked intake or air filter on bank 2 drives bank 2 rich.
High fuel pressure overfuels bank 2.
A leaking injector on bank 2 overfuels that bank.
Fuel vapor from a restricted breather or EVAP fault richens bank 2.
A lazy HO2S on bank 2 cannot correct the mixture.

How to fix 137

Check the bank 2 intake and air filter for a blockage.
Measure fuel pressure and compare it with spec, since this fault reads high.
Check the bank 2 injectors for a leaking one and check fuel pressure.
Test the bank 2 HO2S and replace it only if it fails its own test.
Test the ECM last, only after every circuit test has passed.
Clear the code, then retest to confirm bank 2 runs at the target mixture.

Source

Source review recorded

Sources and review

Review: checked against the recorded source material.

EEC-IV Ford trouble code table (MIL, description, type)
archived reference page (troublecodes.net via Wayback Machine)
Supports: code identity and meaning
Fetched directly. The three-digit row matches the description used in the data file.
https://web.archive.org/web/20030720231430id_/http://www.troublecodes.net:80/Ford/eec-iv.shtml
Ford trouble codes, Contour, Escort, Mustang, Probe, Taurus and Tempo 1992-1995 (code, description, probable cause)
archived reference page (troublecodes.net via Wayback Machine)
Supports: code identity and probable causes
Independent table on the same archive site with matching code identity and a probable cause column.
http://web.archive.org/web/20160501223306id_/http://www.troublecodes.net:80/ford/contour-escort-mustang-probe-taurus-tempo-1992-1995/
Ford EEC-IV trouble code table: code, fault location, probable cause (Crown Victoria, Mustang, Taurus, Thunderbird 1992-1995)
reference page (troublecodes.net)
Supports: per-code probable causes used for the page cause list and test order
Fetched 2026-09-30. The probable cause column is what the page lists, in source order, with the test order built from it.
https://www.troublecodes.net/ford/crown-victoria-mustang-cobralxgt-taurus-thunderbird-1992-1995/

Last updated 2026-10-10.

Report a correction for 137. Include your vehicle, the issue and a source if you have one.